1. Who go to school by bicycle?  => vì Most of my classmates là người nên ta dùng Who

2. What are the students doing in the school yard? => vì learning road signs là hành động nên tả hỏi what..........doing/do

3. Where are the students are learning road signs? => vì in the school yard là nơi chốn nên ta dùng Where

4. Who used to go fishing in the pond near the wood? => vì my father là người nên ta dùng Who

5. How often does Trung ride his motorbike very carefully? => vì usually là từ chỉ tần xuất ta dùng How often


Xin hay nhất nhé ^^

`1.` Who go to school by bicycle? 

`=>` "most of my classmates" chỉ người `->` Who 

`2.` What are the students do in the school yard?

`=>` "learning road signs" chỉ hành động `->` what

`=>` what + tobe + S + V + ...?

`3.` Where are the students learn road signs?

`=>` "in the school yard" chỉ nơi chốn `->` Where

`=>` where + tobe + S + V + ...?

`4.` Who used to go fish in the pond near the wood?

`=>` "my father: chỉ người `->` Who

`=>` Who + used to + V  + ..?

`5.` How often does Trung ride his motorbike very carefully?

`=>` "usually" `->` trạng từ chỉ tần xuất `=>` how often

`=>` how often + do/does + S + V?