78. I'm going to visit after work in the evening

-> TLG

->

+)S + is/ am/ are + going to + V...

-)  S + is/ am/ are + not + going to + V..

79. Residents and store owners have concerned about new mall for few months 

-> HTHT

-> S + Have/has+Vp2+..

80. What is your mom going to do at weekend ?

-> What + be +S + Going to V +..?

81. You ought to go to the market to buy fish and vegetables

-> S + ought to +V +..

82. People did everything without  the help of modern equipment years ago

->Qkđ

-> S + V2/ed+..

83. How old were your brother and sister then 

-> How old + was/were +S + N/Ns+.

84. Some people in the neighborhood are not happy with the changes

-> S + be+not+N/Ns+...

85. It is difficult to learn two languages at the same time

-> It is + adj + to V + N+..

78.Text{ I'm going to visit after work in the evening}

Tương lai đơn 

)S + is/ am/ are + going to + V...

79. Residents and store owners have concerned about new mall for few months 

Hiện tại hoàn thành

 S + Have/has+Vp2+..

80. What is your mom going to do at weekend ?

 What + be +S + going to V +..?

81. You ought to go to the market to buy fish and vegetables

 S + ought to +V +..

82. People did everything without  the help of modern equipment years ago

Quá khứ đơn

S + V2/ed+..

83. How old were your brother and sister then ?

 85. It is difficult to learn two languages at the same time