need vs. must

[Hobby]

Business Idiom in English, Intermediate level

ESL/EFL Test #66 "How to ask the way", question 6

Can you help please because I've lost my way and ......... to get to the shops before closing time?

(a) need
(b) require
(c) request
(d) must

Business Idiom in English, Intermediate level

ESL/EFL Test #66 "How to ask the way", answer 6

Can you help please because I've lost my way and need to get to the shops before closing time?

Correct answer: (a) need
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why need and not must?

Hobby

[Yankee]

.
We use a bare infinitive with must. In other words, you can say "must get", but you cannot say "must to get".

The test sentence includes the words 'to get', so must would not be not grammatically correct.
.
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