Present perfect, past simple или present perfect continuous. 1.oh no! the children (cook). look at the state of this kitchen! 2.how many times wendy (be) late for work this week? 3.i’m going to give that cat some food. it (sit) on the doorstep for hours. i’m sure it’s starving. 4.i (do) grammar exercises all morning. i deserve a treat for lunch. 5.you (not / buy) your mother a present? that’s really mean of you. 6.she (work) in australia for 2 years. then she moved. 7.now where are my keys? this is the third time i (lose) them today 8.you (ever/play) chess? you should try it. i’m sure it’s the sort that you’d like. 9.oh do be quiet. you (grumble) all day! 10.your tennis (really / improve)! you (practice) in secret?

1.Oh no! The children have been cooking. (дети готовят!)__ (cook).
Look at the state of this kitchen!
2.How many times has Wendy been late for work this week?
3.I’m going to give that cat some food. It has been sitting on... (сидит уже несколько часов) on the doorstep for hours. I’m sure it’s starving.
4.I've been doing... (делаю все утро) grammar exercises all morning.
I deserve a treat for lunch.
5.Haven't you bought (not / buy) your mother a present? That’s really mean of you.
6.She worked_ (work) in Australia for 2 years. Then she moved.
7.Now where are my keys? This is the third time I have lost (lose) them today
8.Have you ever played (ever/play) chess? You should try it. I’m sure it’s the sort that you’d like.
9.Oh, do be quiet. You have been grumbling__ (grumble) all day! (Бурчишь целый день!)
10.Your tennis has really improved! Have you been practicing in secret?
(Ты намного лучше стал играть в теннис! Тренировался тайком?)