Some verbs are followed only by the infinitive. These verbs cannot be followed by a gerund.
- He agreed to climb Mt. Everest with me.
- He promised to climb Mt. Everest with me.
- I hope to climb Mt. Everest.
- He decided to climb Mt. Everest.
- I managed to climb Mt. Everest.
'Agree/promise/hope/decide/manage climbing' is incorrect. Verbs only followed by infinitives include: want, expect, intend, decide, hesitate, wish, hope, promise, plan, offer, agree, manage, pretend.
Some verbs are followed only by the gerund. These verbs cannot be followed by the infinitive.
- They discussed climbing Mt. Everest.
- She suggested climbing Mt. Everest.
- I enjoyed climbing Mt. Everest.
- I postponed climbing Mt. Everest due to a health problem.
The following verbs are in this category: finish, enjoy, appreciate, miss, admit, mind, avoid, escape, postpone, permit, suggest.
Some verbs can be followed by either the infinitive or the gerund with the same meaning. The following verbs are in this category: like, love, start, begin.
- I like hiking.
- I like to hike.
- They continued to argue throughout the night.
- They continued arguing throughout the night.
Some verbs can be followed by both the infinitive and gerund, but the meaning differs. For example, “stop to do something” and “stop doing something” have different meanings. The following verbs are in this category: stop, forget, remember, regret.
- I stopped inviting him to my parties. (= I used to invite him, but no longer do)
- I stopped to admire the view. (= I was hiking, but stood still to look at the view)
- I regretted inviting him to the party. (= I wish I had not invited him)
- I regret to inform you that our company will not be hiring you. (= I am sorry to have to tell you this)