Before he left vs. Before he leaving

English as a Second Language English Vocabulary, Grammar and Idioms
1

Hi.

“He said he’d call me before he left the office.”
Can I also say “He said he’d call me before he leaving the office”?

“The instructor told us to read the instructions before trying to use the machine.”
Can I say “The instructor told us to read the instructions before to try to use the machine”?

Many thanks in advance.

Greetings.

F

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2

If you leave out the second “he” it’s OK.
He said he’d call me before leaving the office

No. But you can say:
The instructor told us to read the instructions before we try to use the machine

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