Determine whether a verb is followed or not"to do"Still"doing"It depends on the object after the verb or the grammatical role of the verb in the sentence. Here are some suggestions:
Pick up"to do"Situation:
It is usually used when a verb is followed by an object (noun or pronoun)."to do"。For example:i want to learn english.(Here.)"to learn"Yes"want"object).
It is also used when the verb is followed by a verb infinitive (to + verb form)."to do"。For example:she decided to visit her friends.
Pick up"doing"Situation:
It is usually used when a verb is followed by an object (noun or pronoun) and an adjective after the object"doing"。For example:i enjoy swimming.(Here.)"swimming"Yes"enjoy"object, while"swimming"After"enjoyable"is an adjective).
It is usually used when the verb is a sensory verb like see, hear, feel, watch, notice, etc"doing"。For example:i heard him singing.
Overall, this use"to do"Still"doing"The choice is influenced by the nature of the verb itself and its role in the sentence. Some verbs tend more to with"to do"combined, and some are more inclined to"doing"Combine. A lot of input in reading and listening can help you grasp these collocations more naturally. In addition, some common verb collocations can also be found through grammar books or grammar resources.