Verb Test 61

The basic rule of Subject-Verb agreement is that a singular subject takes a singular verb while a plural subject takes a plural verb. The verb must always agree with the subject of a sentence. 

In order to choose the sentence with the correct subject and verb agreement, let's understand what subject-verb agreement is. If the subject of the sentence is singular, the verb must be in its singular form; and if the subject of the sentence is plural, the verb must be in its plural form. 
Option A - 'Either Ridhima or Pooja have won' means one has won. The conjunction 'either-or' means any one of the two nouns or subject. Hence, there is just one main subject in the sentence, and the verb should be in its singular form too. 'Have' is a plural verb form and can't be used with a singular subject. Thus, option A is incorrect.
Option C - 'Ridhima and Pooja is winner' means both of them are winners. The conjunction 'and' is used in case of more than one subject or noun. As the subject in the given sentence is plural, the verb should be in its plural form as well. However, 'is' is a singular auxiliary verb and can't be used with plural subject. Hence, option C is incorrect.
Option D - 'Ridhima or Pooja are winner' is incorrect. The conjunction 'or' is used to indicate a singular subject/ choice. 'Are' is a plural verb form and can't be used with a singular subject. Hence, option D is incorrect.
Option B - 'Either Ridhima or Pooja has won' is grammatically correct as both the subject and the verb agree with one another in the sentence. 'Either-or' is used to indicate a choice/ singular subject in a sentence. 'Has' is a singular verb form and hence, it can be used with a singular subject. Thus option B is the correct answer.

The sentence uses the conjunction 'but' which indicates contrast. Here, the action in the subordinate clause cannot be done if the action in the main clause is not known. Essentially, to know how to program a computer, one must know how to use it. So, one must have the knowledge to use a computer to program it.
"Is/isn't" in option A is incorrect as the auxiliary verbs are ungrammatical in the context.
"Can/can" in option B is incorrect because to know how to program a computer the first blank is understood or does not need to be mentioned. 
"Can/can't" in option C is correct as one can know how to use a computer and not know how to program it. 'But' indicates that this option is correct.
"Can't/can't" is incorrect as if one does not know how to use a computer, there is no need to state that they can't program it.
Therefore, option C is the correct answer.

Option C: The verb 'are' is plural whereas 'five gallons' is singular. 'Gallon' is a unit of measure and is hence spoken of as a singular unit. When the subject 'five gallons' is singular, the verb that follows will also be singular. This is called the subject-verb agreement.

"She'd rather" in option A is incorrect as 'rather' is used to favour one choice over another. Here, no comparison takes place. So, rather is incorrect.
"She'd prefer" in option B is correct as 'prefer' is used to indicate choice without the need to compare with anything. In this case, there is no need to explain what other options can be used to reach home, such as riding a cycle, driving a car, going on the bus etc. But, 'walk' is the preferred mode over anything specified or unspecified. Thus, this is correct.
"She'd better" in option C is incorrect  as this is used to talk about actions which are desirable in a specific situation. Here, the speaker herself 'prefers' the action and desirability of the action is not under discussion.
"She has gots" in option D is incorrect as 'gots' is ungrammatical and incorrect.
Therefore, option B is the correct answer.

"Could/can" in option A is incorrect as 'could' suggests the ability to ski. But, the use of 'but' suggests contrast. Thus, the first blank should indicate inability.
"Can/could" in option B is incorrect as both suggest ability. This is incorrect
"Could/can't" in option C is incorrect as the context does not agree with the ability to do something and the inability to do it later.
"Couldn't/ can" in option D is correct as the conjunction 'but' indicates a contrasting statement in the subordinate clause. Here, the subordinate clause also mentions 'very well', which suggests an expertness in the ability to complete an action. Thus, both options match the context.
Thus, option D is the correct answer.

In the given case we need to study the adverb 'well' and its comparative degree 'very well'. The former indicates proficiency and the latter indicates being better in comparison to other things.
"Can't/can" in option A is the correct answer as 'can't' indicates not being proficient at football and 'can' in the second blank indicates being very proficient at ice hockey. 
"Could/can't" in option B is incorrect as 'could' indicates the ability to complete an action in the past. This might seem correct, but the second option 'can't' does not suit as it does not need 'very well'. If you are not proficient at a task, then just using the adverb 'well' would be enough. Use of the comparative degree 'very well' indicates being very good at ice hockey. So, this does not agree with the context.
"Could/can" in option C is incorrect as the conjunction 'but' indicate a contrast of the ability. This does not agree with the context.
"Can/could" in option D is incorrect as 'but' indicates a  contrast.
Thus, option A is correct.

Since a fact relevant to the present is being stated, smple present tense(am/is/are) should be used. As the pronoun is in singular, the verb will also be singular. Hence, Option A is correct. The rest of the options do not adhere to this rule, hence incorrect. 

The context refers to an action completed in the past. It requires a past tense form of the base verb 'be'. 
"Is" in option A is incorrect as "is" is used to indicate the simple present. 
"Was" in option B is correct as "was" is used to indicate the simple past tense. It correctly indicates the weather yesterday (past).
"Were" in option C is incorrect as it is used to indicate the simple past of 'be'. However, we need the simple past of the auxiliary verb 'is'.
"Wasn't" in option D is incorrect as the answer to the interrogative statement begins with 'yes'. Thus, it indicates agreement over the question. So, the weather was hot.
Therefore, option B is the correct answer.

The subordinate clause of the sentence uses the conjunction 'but'. This indicates a contrasting statement. Hence, we can draw the conclusion that the little sister was unable to draw, but is able now. Keeping this in mind "couldn't/was/can" in option C is the correct answer. It indicates the inability to draw in the past. Thus, 'couldn't/was' and the ability to draw now, thus 'can'.
"Could/can/can" in option A is incorrect as the first option 'could' rules out the complete option. 
"Can/was/could" in option B is incorrect as "can" indicates ability. However, 'but' indicates contrast. No one, due course of events, forgets to draw alone once they learn it (unless something drastic has happened, though no such conditions have been given).
"Was/can/could" in option D is incorrect as the auxiliary verb 'was' used here without a main verb is incorrect.
Thus, option C is the correct answer.