Đáp án`+`Giải thích các bước giải:

`1,` Are they learning new things?

 when is he starting work?

`2,` why am i staying at home?

`3,` is it getting dark?

`4,`the dog isn't playing with a ball

`5,` why is it raining now?

`6,` how is she travelling?

`7,` where are you working?

`8,` what are we watching?

`9,` am i taking too much cake?

`->3,4,5,6` chủ ngữ số ít dùng is`+` v-ing

`->1,7,8` chủ ngữ số nhiều dùng are `+` v-ing

`->2,9` chủ ngữ là i dùng am `+` v-ing

`->1,2,3,5,6,7,8,9` là câu hỏi nên tobe trước chủ ngữ

`1.` Are they learning nwe things?

`2.` When is he starting work?

`3.` Why i am staying at home?

`4.`  Is it getting dark?

`5.` Why is it raining now?

`6.` How is she travelling?

`7.` Where are you working?

`8.` What are we watching ?

`9.` Am I taking too much cake?

`-----`

`*` công thức: thì HTTD

`( + )` S + tobe + V-ing

`( - )` S + tobe + not + V-ing

`( ? )` Tobe + S + V-ing?