Question
Parts of the following sentence have been given as
options. Select the option that contains an error. By the time the train arrives, we were waiting at the platform for over an hour.Solution
There is a tense mismatch in the sentence:
The phrase “the train arrives” is in the present tense.
However, “we were waiting” is in the past continuous tense, which does not logically fit with the rest of the sentence.
To indicate that an action will have already been ongoing by the time something else happens in the future, we need the future perfect continuous tense:
The correct form is: “we will have been waiting”.
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