"Let's" plus infinitive

[rully]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #119 "Gerund or Infinitive", question 5

Let's ......... there tomorrow if it's fine.

(a) going
(b) gone
(c) go
(d) goes

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #119 "Gerund or Infinitive", answer 5

Let's go there tomorrow if it's fine.

Correct answer: (c) go

Your answer was: incorrect
Let's going there tomorrow if it's fine.
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Please explain why use go,,
why not use going because of there is sentence tomorrow

Thanks

rully

[Alan]

Hi rully,

Let is regualarly followed by an infinitive form and not a gerund form as in:

Let's (Let us) go there by car.

I'll let you drive.

Let me help you.

Let go of that.

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