the gerund or infinitive + to
an infinitive: (to) go + (to) walk + (to) drink
a gerund: going + walking + drinking
When do you use a gerund?
* When the gerund is the subject of the sentence:
* After one of these verbs: love, stop, start, keep on, avoid + enjoy
* After a preposition (in, on, under, behind, without, etc
* After these expressions: no use, worth, look forward to
In all other cases you use the infinitive - do exc D - WB page 82