Present perfect simple and continuous 1)I ___ the windows all day without any help! Two more and I can have a rest.
a)'ve been washing
b)'ve washed

2)You look nice! Have you ___ your hair cut?
a)been having
b)had

3)Has someone ___ my special bread? There's only a little bit left.
a)been eating
b)eaten

4)___ four goals and it's only half-time!
a)They've been scoring
b)They've scored

1) I've been washing the windows all day without any help! Two more and I can have a rest.

In this sentence, we use the present perfect continuous tense. This tense is used to show an action that started in the past and is still ongoing at the time of speaking. The verb "wash" is in the present perfect continuous form, which is "have/has been + verb + ing". The correct answer is 'a) 've been washing'.

2) You look nice! Have you had your hair cut?

In this sentence, we use the present perfect simple tense. This tense is used to show an action that happened at an unspecified time before now. The verb "have" is in the present perfect simple form, which is "have/has + past participle". The correct answer is 'b) had'.

3) Has someone been eating my special bread? There's only a little bit left.

In this sentence, we use the present perfect continuous tense. This tense is used to show an action that started in the past and is still ongoing at the time of speaking. The verb "eat" is in the present perfect continuous form, which is "have/has been + verb + ing". The correct answer is 'a) been eating'.

4) They've scored four goals and it's only half-time!

In this sentence, we use the present perfect simple tense. This tense is used to show an action that happened at an unspecified time before now. The verb "score" is in the present perfect simple form, which is "have/has + past participle". The correct answer is 'b) They've scored'.

Note: It's important to remember that the present perfect simple is typically used when the result of the action is more important, while the present perfect continuous is used when the duration or the process of the action is more important.