36.→ I think playing sports is interesting and necessary.

S + find + doing something + adj.

→S + think + doing something + be + adj.

37.→ I had a temprature so I couldn't go to school yesterday.

Because S + V, S + V.

→ S + V so S + V.

38.→ David has collected stamps and coin since 2010.

S + started/began + V_ing + Thời gian + ago / in + thời gian.

→S + have/has + $V_{3}$ + for + thời gian / since + thời gian.

39.→ We should give blankets and warm clothes to homeless children.

It's a good idea / a great idea to + V.

→S + should + V_inf .

40.→ I have never donated blood before.

This is the first time S + have / has + $V_{3}$ .

→S + have / has + not + $V_{3}$ + before.

36. I think .........................................

37. ....................... so ..........................

38. David has started ..................

39. We should give....................

40. .................. donated blood before