I have changed three jobs ____ moved to New York.

He has been working as a manager ____ twelve years.

Wait here ____ I come back.

I have to finish this project ____ tomorrow’s evening.

until

before

since

by

for

Correct answers:

• I have changed three jobs since I moved to New York.
• He has been working as a manager for twelve years.
• Wait here until I come back.
• I have to finish this project by tomorrow’s evening.

Since means “from a certain moment in the past”. For shows a period of time. Until means “up to the moment when something happens”. By means “not later than”.

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