When to use when

[sail]

Test No. errors/elem-2 "Be careful", question 4

He needs to be more carefully when he is driving his car.

(a) needs to
(b) carefully
(c) is driving

Test No. errors/elem-2 "Be careful", answer 4

He needs to be more careful when he is driving his car.

Correct entry: careful
The error was: (b) carefully
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Can u tell me when should we use the word "when"? I heard that "when" is only possible while we are using past tense/ past continuoes tenses. Can u clarify my doubt about "When" usage.

thank u.,

[Torsten]

You can use the word when to talk about events in the past, the present and the future. In the sentence you are referring to when describes an action that happens on a regular basis:

He needs to be more careful when he is driving his car.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary