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Hello

Which one of these sentences is correct?

- Thank you for help us.

- Thank you for helping us.

regards
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The second. A verb must be in the -ing form after a preposition.

CJ
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The same. "For" is a preposition, and is always followed by the -ing form (gerund).

If you want to express purpose with an infinitive, it's "to": "I wrote to Diana to thank her for the present she sent me".
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Comments  
CalifJimThe second. A verb must be in the -ing form after a preposition.

CJ

OK

Which one is correct?

- Thank you for contact us.

- Thank you for contacting us.

If the first is correct, why?
 pieanne's reply was promoted to an answer.
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"Thank you for helping us" is the correct form.