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‘Not sure if it is.’ (NOT + non-finite or ellipted clause)

Let’s look at the most common examples of non-finite or ellipted claused used after ‘not’. Usually, we would say: I am not sure if it is possible. But we can remove the subject and verb to make an ellipted clause: Not sure if it is possible. We can also say: This is a petrol car …

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present perfect continuous questions

In the English Grammar Profile, B1 point 31 in the category of PAST is defined: present perfect continuous: QUESTIONS with a limited range of verbs. Note that questions are generally low frequency in the CLC probably due to lack of spoken data. *Also note that there are no other entries for ‘range of verbs’ PELIC …

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