Grammar check *please ignore my previous post

[babyblue]

The sentense should be :

"We had know each other for 3 year by April".

Sorry for confusing you.
Please let me know whether it is grammatically right and acceptable.

[Alan]

From what you have written it is not clear whether you are looking back to last April or looking forward to next April. There are therefore two possibilities:

By last April we had known each other for 3 years.

By next April we will/shall have known each other for 3 years.
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English as a Second Language
You can read my ESL story Present Simple