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Sentence Correction: Subject Verb Agreement - A Plural Subject Consisting of Singular Nouns that are Connected by 'and'

It is a common mistake to think that a solid melting into liquid and a liquid evaporating into gas is merely a result of changes in temperature when, in fact, changes in the state of matter is also largely affected by pressure.

This answer choice corrects both original subject Verb Agreement mistakes. It is also stylistically better than the original sentence: replacing the two-word phrase in fact with the single word actually is more concise. However, it changes the meaning of the original sentence by omitting the word also

Pay attention that such a **meaning change** is more serious because now it is saying that the change is due to pressure, whereas the **intended meaning** is that pressure is _also_ a part of the equation.

While this answer choice corrects one of the original Subject Verb Agreement mistakes, it repeats the other. The plural subject changes in state of matter does not agree with the singular verb is.

What helps us identify this mistake is the following Stop Sign:

A long complex subject / long distance between the subject and the verb

In addition, this sentence changes the meaning of the original sentence by changing also to only.

This answer choice is grammatically incorrect. It contains two Subject Verb Agreement mistakes.

First, the plural subject a solid melting into liquid and a liquid evaporating into gas does not agree with the singular verb is.

In addition, the plural subject changes in state of matter does not agree with the singular verb is.

[[snippet]]

Great!

This answer choice corrects both original grammatical mistakes.

First, the plural subject a solid melting into liquid and a liquid evaporating into gas correctly agrees with the plural verb are.

In addition, the plural subject changes in state of matter correctly agrees with the plural verb are.

[[snippet]]


While this answer choice corrects one of the original Subject Verb Agreement mistakes, it repeats the other. The plural subject solids melting into liquids and liquids evaporating into gas does not agree with the singular verb is.

What helps us identify this question as a Subject Verb Agreement question and detect this mistake is the following Stop Sign:

A plural subject made up of singular nouns connected by and

a solid melting into liquid and a liquid evaporating into gas is merely a result of changes in temperature when, in fact, changes in the state of matter is also
solids melting into liquids and a liquids evaporating into gas is only a result of changes in temperature when, in fact, changes in the state of matter are also
a solid melting into liquid and a liquid evaporating into gas are only a result of changes in temperature when, in fact, changes in the state of matter are also
a solid melting into liquid and a liquid evaporating into gas are only a result of changes in temperature when, in fact, changes in the state of matter is only
solids melting into liquids and liquids evaporating into gas are only a result of changes in temperature when, actually, changes in the state of matter are