TOEFL 1.1.3 Verbs that Require an -ing Form in the Complement

Remember that the following verbs require an -ing form for a verb in the complement.

admit	complete	deny
appreciate	consider	discuss
avoid	delay	enjoy
finish	practice	risk
keep	quit	stop
mention	recall	suggest
miss	recommend	tolerate
postpone	regret	understand

S	V	C(-ing)	M
He	enjoys	traveling	by plane

Avoid using an infinitive after the verbs listed.

Forbid may be used with either an infinitive of an ­-ing complement, but forbid from is not idiomatic.

Examples:

Incorrect	: She is considering not to go.
Correct	: She is considering not going.
Incorrect	: We enjoyed talk with your friend.
Correct	: We enjoyed talking with your friend.
Incorrect	: Hank completed the writing his thesis this summer.
Correct	: Hank completed writing his thesis this summer.
Incorrect	: I miss to watch the news when I am traveling.
Correct	: I miss watching the news when I am traveling.
Incorrect	: She mentions stop at El Paso in her letter.
Correct	: She mentions stopping at El Paso in her letter.

Source:
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Baron's How to Prepare for the TOEFL