We (walk) ten kilometres. we (walk) for three hours. you (walk) too fast. that’s why you are tired. i (make) sausage rolls for the party all the morning. how many you (make)? ~ i (make) 200. that boy (eat) seven ice-creams he (not stop) eating since he arrived. the driver (drink). i think someone else ought to drive. i (pull) up 100 dandelions. i (pull) up dandelions all day.

We walked  ten kilometres.We have waled for three hours.
You are walking) too fast. That’s why you are tired. 
I have been making) sausage rolls for the party all the morning.
How many have you made)? ~ I have made (или просто made) 200.
That boyhas eaten) seven ice-creams
He hasn't stopped eating since he arrived. 
The driver has drunk). I think someone else ought to drive.
I pulled up 100 dandelions.
I have been pulling) up dandelions all day.