When vs. which

[ritu chopra]

English Grammar Tests, Elementary Level

ESL/EFL Test "Question Words", question 5

Let me know ......... you hear from your mother.

(a) who
(b) which
(c) whose
(d) when

English Grammar Tests, Elementary Level

ESL/EFL Test "Question Words", answer 5

Let me know when you hear from your mother.

Correct answer: (d) when
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why we used "when" here and not which

ritu chopra

[Alan]

Hi ritu chopra,

Here in this sentence you need a conjunction of time (when) and not the relative pronoun (which).

Alan
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English as a Second Language
You can read my ESL story Present Simple

[Jordano]

hey alan, hear from someone means to know something about him. I can't explain in english, but i think so.
I haven't heard from Jorge for a long time. does this mean that I didn't have news about Jorge? Am I wrong or right?
thank you.

[Alan]

Hi Jordano,

You have to make a distinction between 'hear from' and 'hear about'. If you hear from someone, this is a letter/email/phone call from the actual person. If you hear about someone, it means you receive news concerning someone and what they are doing.

Alan
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English as a Foreign Language
You can read my EFL story Progressive Forms