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 Phrasal Verbs/take