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b. Then I tried knocking on the door...

c. We tried to put the fire out...

d. She tried asking Gerry.

e. I tried to reach the shelf

f. I am trying to concentrate

2

a. I need to go away

b. She need be looked after

d. It needs to be cut

e. you don't need to iron that shirt. It doesn't need to be ironed

3.

a. I couldn't help overhearing what they said

b. Can you help me (to) get -  *оба варианта "to get/get" правильные

c. I can help smiling

d. the fine weather helped (to)make it a very enjoyable holiday