Verb Tense Consistency Exercise 1

Grammar review Verb tense consistency — the core idea

What is verb tense consistency?
When you describe a series of actions or states that belong to the same time frame, you should use the same tense throughout. Switching tenses without a reason creates confusion for the reader.

Parallel actions in a list — keep the tense the same:
She sat down, opened her book, and started to read. (all simple past — correct)
She sat down, opened her book, and has started to read. (simple past + present perfect — inconsistent)

The most common error: mixing simple past and present perfect
Simple past describes a completed action at a specific past time.
Present perfect describes a past action with a connection to the present.
These two tenses describe different things and should not be mixed in the same sequence.
I washed the car, vacuumed the inside, and cleaned the windows. (correct)
I washed the car, vacuumed the inside, and have cleaned the windows. (inconsistent)

Mixing progressive forms in a list:
Similarly, if you begin with a progressive form, stay with it.
He was laughing, singing, and telling jokes. (all past progressive — correct)
He was laughing, singing, and tells jokes. (inconsistent)

Note: Not all tense changes are errors. If a sentence describes actions at genuinely different times, the tenses will — and should — differ. Look at context, not just surface form.