Common mistakes

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We couldn't risk to leave him alone.

We couldn't risk leaving him alone.

Please excuse my being so late

Please excuse me to be so late.

Also possible:

Please excuse me for being so late.

Simon insisted to go to London.

Simon insisted on going to London.

I look forward to see him soon.

I look forward to seeing him soon.

Have you finished to speak?

Have you finished speaking?

to + infinitive or the gerund follow verbs meaning to begin: She began to speak, or She began speaking.

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