Multiple choice

I couldn't help ___ when he told me that story.

  1. laugh

  2. laughed

  3. laughing

  4. to laugh
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The phrase is 'couldn't help laughing'. After 'couldn't help' or 'can't help', we always use the -ing form (gerund). This is a fixed idiomatic structure. 'Laugh', 'laughed', and 'to laugh' are grammatically incorrect after 'couldn't help'.

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