Question

When Can I use form -ing ?

Answer 1

The -ing form can be used in these patterns:

• When you talk about preferences: I like swimming; I hate watching TV. (Person + like /hate/ love + -ing)
• When you talk about an activity: Studying for exams is hard; Walking in the rain is nice.( -ing + verb)
• You can finfd the -ing functioning as an adjective: sleeping pills; walking stick; smoking room. (-ing +noun)
• You should use -ing after prepositions: I am interested in learning Chinese; I am keen on having pasta. ( preposition +-ing)

Answer 2

 The -ing form can be used as a noun. For example: "reading is my favorite activity in my spare time."

 It can also be used as an adjective, for example: "That movie had a very surprising end".

 The -ing form can also be used as a verb in the progressive or continuous tense, for example: "I am watching TV now." (I am watching TV at this moment). Or: "I was waiting for him, when she told me he would not come to the party."  (The action of waiting was in the past, when I heard he would not come to the party).