Read the sentences and put the verbs into the correct form.

1. i rang the doorbell, but there was no answer. then i tried
on the door, but there was still no answer. (knock)

2. my grandmother isn’t able to look after herself any more. she needs
after. (look)

3. your hair is getting very long. it needs
. (cut)

1. The first sentence is asking the student to put the verb "knock" into the correct form. The original sentence says "then I tried on the door, but there was still no answer." The correct form of "knock" in this sentence is "knocking".

So the sentence should be: "Then I tried knocking on the door, but there was still no answer."

Explanation: The verb "knock" describes the action of hitting or tapping on a door or surface with your knuckles or a similar object in order to get someone's attention. In this sentence, the person tried knocking on the door to see if someone would answer.

2. The second sentence is asking the student to put the verb "look" into the correct form. The original sentence says "My grandmother isn't able to look after herself anymore. She needs __________." The correct form of "look" in this sentence is "looking".

So the sentence should be: "My grandmother isn't able to look after herself anymore. She needs looking after."

Explanation: The verb "look after" means to take care of or be responsible for someone or something. In this sentence, the grandmother is not able to take care of herself anymore and needs someone to look after her.

3. The third sentence is asking the student to put the verb "cut" into the correct form. The original sentence says "Your hair is getting very long. It needs _______." The correct form of "cut" in this sentence is "to be cut".

So the sentence should be: "Your hair is getting very long. It needs to be cut."

Explanation: The verb "cut" means to remove or shorten something with a sharp tool or object. In this sentence, the person's hair has gotten very long and it needs to be shortened by cutting it.