1. I grew 3 cm a year.

2. I grew by 3 cm a year.

(Does #1 mean #2? Is 'by' omitted before 3 cm? Then 'grew' is an intransitive verb. If not, 'grew' is a transitive verb.)

2 answers

Both are correct.

Sra
Both statements suggest that — in the past — you grew 3 cm each year. If the growth was only in one year, you could designate the year:

"I grew 3 cm last year."

I hope t his helps a little more. Thanks for asking.
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