U12. For and since

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Please carefully analyze each sentence before deciding how to adjust the word in parentheses to fit in it. You might have to change its form (make a different part of speech out of it) or person, number.

Please carefully analyze each sentence to see how the word in parentheses needs to change in order to fill the blank. You might have to change it to a different part of speech, or for a verb, - change person, number.

Please carefully analyze each sentence to understand how the word in the parentheses fits into the blank. You might have to change the word form (making it a different part of speech), person or number.