Conjunctions Test 4

A conjunction is a word used to link other words, clauses or phrases. The given sentence is in the past tense and 'they' is the plural third person. In such case, 'were' helping verb is used for past tense. 'Was' is used with a singular person in the past tense. 'but' is used to contrast ideas. 

A conjunction is a word which connects other words, phrases and clauses. 

A conjunction is used to connect words, clauses or phrases. 

The main function of a conjunction is to join or connect two clauses as one. In the given sentence, the comma "," makes it easier to separate the clauses as "you are taller than me" and "you should be the one to climb the wall", where the former is the subordinate clause that depends on the latter, the main clause, for its full meaning. The sentence is cause-related, where the subordinate clause is the cause for which the action in the main clause takes place "you should climb". "Since" does the job of linking the clauses, it performs no other function as another part of speech, hence 'since' is a conjunction and option B is correct. 'You' is a second person singular pronoun, pronouns modify nouns that have been identified with or mentioned before. Here, 'you' modifies the listener who's being addressed. It does not link the clauses together, as it's a part of the main clause. Hence option A is incorrect. 'Should' is a modal auxiliary, a verb that determines the tense or mood of the sentence, here 'should' refers to an obligation to "climb the wall". It does not link the clauses, it's a part of the main clause, hence it's not a conjunction and option C is incorrect. 'Wall' is a noun which means "a structure that is built for security reasons', it does not link the clauses together as it's a noun. Hence option D is also incorrect.

'While' has multiple parts of speech, depending on the context of the sentence. 'While' as an adverb modifies a verb, an adjective or another adverb, it means 'during which'. As 'while' does not modify any of these in the given sentence, option A is incorrect. 'While' as a noun does not modify pronouns, and 'you' is a pronoun, also, 'while' (noun) refers to 'a period of time', as it doesn't refer to any period of time here, it is not a noun and option B is incorrect. Prepositions and conjunctions may have the same words, but they are distinguished depending on their function. A preposition links the noun or pronoun to the rest of the sentence, without which the sentence would not be complete in its meaning, like 'on' in 'on the table' or 'into' in 'into the street', whereas a conjunction links a clause or a sentence to another clause or sentence, "you sleep" is a clause, hence 'while' is a conjunction and not a preposition. Hence, option C is incorrect and Option D is correct.

A conjunction's main function is to join or combine two clauses as one, and the type of conjunction used depends on the relationship between these clauses. In the given sentence, "the thunderstorm passed" is a subordinate/dependent clause as it depends on the main clause "a rainbow appeared in the sky" for its full meaning. The comma ',' determines that these are separate clauses, and 'though' is a conjunction as it combines them as one sentence, without which the sentence is incomplete. 'After' is a subordinating conjunction used for time-related sentences as the one given, and option C is thus, correct. 'The' is an article that modifies the noun "thunderstorm" as a specific noun, and does not connect the clauses together, it's an article hence option A is incorrect. 'A' is also an article, as it modifies the non specific noun "rainbow", it's an article hence option B is incorrect. 'In' is a preposition that links the noun "sky" to the verb "appeared". It establishes a connection between these two words, and not the clauses. Hence it's not a conjunction and option D is incorrect.

A conjunction's main function is to join or combine two clauses/sentences as one sentence. The type of conjunction used depends on the relationship between the clauses, and whether both the clauses are independent or not. The clauses in the given sentence are both independent, as "She was tired" and "she stayed up to keep her brother company" are complete in meaning, without depending on the other. Hence the conjunction that joins these two is the word that remains, "yet" which is an adversative conjunction i.e., for sentences which are contrast in meaning, "she was tired" and "stayed up". Hence option B is correct. 'Tired' is an adjective as it modifies the pronoun 'she', by describing her state "tired". It does not combine the clauses, as those formed before and after 'tired' are both incomplete in meaning. Hence option A is incorrect. 'She' is a pronoun in the third person singular form, a person whom the speaker talks about to the listener. It does not join the clauses, as after omitting it the clause "was tired" is incomplete and the pronoun is required. Hence it's not a conjunction and option C is incorrect. 'Up' is an adverb that modifies the verb 'stayed' and it means "to be awake". It does not connect the clauses as when you omit 'up' the clauses formed before and after it are incomplete in meaning, hence option D is incorrect.

Option B - 'Should' is a modal auxiliary/verb and not a conjunction. Thus option B is incorrect. 

The main function of a conjunction is to join or combine two clauses as a statement. In the given sentence, the clauses are identified as "He refused to do his homework" and "he thought he would not be able to do it". The latter is a subordinate/dependent clause, as it depends on the former clause, which is the main/independent clause for its full meaning. The word left behind is 'because', without which the clauses are grammatically complete, but they do not sound as a complete sentence. Hence, "because" is a conjunction that is used for cause-related sentences "he thought he would not be able" which is the cause for the action "refused to do homework" in the main clause. Hence, option C is correct. 'He' is a pronoun in the third person singular form, as pronouns modify the nouns which have been identified with or mentioned before. It does not combine the clauses and without it the main clause is grammatically incomplete. Hence option A is incorrect. 'Would' is a modal auxiliary as it determines the mood or tense of the sentence, it does not combine the clauses, hence it's not a conjunction and option B is incorrect. 'Do' is a verb that means 'to perform an action', it refers to an action performed, and does not combines the clauses, hence option D is incorrect.

The correct answer is Option C.