`20.` don't have

`-` every morning `-` HTĐ

`21.` Does `-` live

`22.` are

`23.` Do `-` travel

`-` every year `-` HTĐ

`24.` Do `-` often read

`25.` Does `-` work

`26.` Does `-` arrive

`27.` Do `-` play

`-` every weekend `-`HTĐ

`28.` Do `-` travel

`-` every summer `-` HTĐ

`29.` Does ` work

`30.` Does `-` work

`____________________`

`-` HTĐ: `(?)` Do/does + S +  V_inf + O?

`+` Does + he/she/it/DTSI 

`+` Do + I/you/we/they/DTSN 

`***` CT thì HTĐ với động từ thường:

`(+)` S + V(s/es)

`(-)` S + don't/doesn't + V-inf

`(?)` (WH-) + do/does + S + V-inf?

`-` Do/Don't đi với I, We, You, They, N số nhiều

`-` Does/Doesn't đi với He, She, It, N số ít

`***` CT thì HTĐ với tobe:

`(+)` S + is/am/are + N/adj

`(-)` S + isn't/am not/aren't + N/adj

`(?)` (WH-) + is/am/are + S + N/adj?

`-` I + am

`-` He/She/It/N số ít + is

`-` We/You/They/N số nhiều + are

`--------------`

`20.` don't have

`21.` Does she live

`22.` are

`23.` travel

`24.` often read

`25.` Does he work

`26.` Does the train arrive

`27.` Do you play

`28.` travel

`29.` Does his brother work

`30.` Does Mark work