116.The world (be) ........is....... round.
117.A: What ..........are you doing........... (you/do) now? ( now -> HTTD)

B: I (write) ...am writing... to my parents. I (write) ....writes..... to them every month ( every -> HTD)
118.Look! It (snow) ..............is snowing............ 
119.A: What time ...........do you usually finish.............. (you/usually/finish) work? ( usually -> HTD)
B: I often (finish) .........finish..... my work at 5pm everyday.
120.A: How (you/travel) ............do you travel....... to work everyday?
B: I always (go) .......go..... to work by car everyday. But now I (go) ......am going..... to work on foot because my car (be) .......was........ broken.
121.The earth (circle) .......circles........ the sun once every 365 days.
122.It (get) .......is getting........ out of date now.
123.Ronaldo (come) .......will come... to Viet Nam next August.

116. is

CT: S + tobe / V(s) + ...

117A.are you doing

CT: What + tobe + S + V-ing + ...?

117B. am writing

CT: S + tobe + V-ing + ... 

118. is snowing

CT: S + tobe + V-ing + ...

119A. do you usually finish

CT: Do/Does + S +(TTTS) + V(inf) + ...?

119B. finish

CT: S + (TTTS) + V(s) + ...

120A. do you travel

CT: Do/Does + S +(TTTS) + V(inf) + ...?

120B. go - am going - was 

CT: - S + (TTTS) + V(s) + ...

- S + tobe + V-ing + ... 

- S + tobe + PII + (by O).

121. circles

CT: S + (TTTS) + V(s) + ...

122. is getting

CT: S + tobe + V-ing + ... 

123. is going to come

CT: S + tobe + going to + V(inf) + ... + một thời điểm nhất định trong tương lai.