`-` Thì HTTD ( NV ) : Is / Am / Are + S + V-ing ?

`1`.Who is playing football in the playground at the moment ?

`\rightarrow` Who dùng để hỏi về người

`2`.What is the boy doing in the playground at the moment ?

`\rightarrow` What dùng để hỏi về cái gì

`3`.Where is the boy playing football at the moment ?

`\rightarrow` Where dùng để hỏi về địa điểm

`4`.When is the boy playing football in the playground ?

`\rightarrow` When dùng để hỏi về mốc thời gian

`\text{# TF}`

The boy is playing football in the playground at the moment.

`->` Who is playing football in the playground at the moment?

  + Who dùng để hỏi về người (the boy: cậu bé)

The boy is playing football in the playground at the moment.

`->` What is the boy doing in the playground at the moment?

  + What dùng hỏi cái gì (is playing football ở thì Hiện tại tiếp diễn: S + is/am/are + V-ing)

The boy is playing football in the playground at the moment.

`->` Where is the boy playing football at the moment?

  + Where dùng để hỏi nơi chốn (in the playground: ở sân chơi)

The boy is playing football in the playground at the moment.

`->` When is the boy playing football in the playground?

  + When hỏi thời gian (at the moment: hiện giờ, hiện tại)