we/custom/do exercise/ every morning 2.It''s not necessary for them to wear a uniform at school in the USA -)They don't have??

we/custom/do exercise/ every morning

=> we have a custom of doing exercise every morning

+ have a custom of doing S.th: có phong tục làm j đó

2.It''s not necessary for them to wear a uniform at school in the USA

=> they don't have to wear a uniform at school in the usa

+ tobe+ not necessary+forS.O +to do S.t= have to + V: bắt buộc làm j đó

1. we/custom/do exercise/ every morning

=> we have a custom of doing exercise every morning

* have a custom of doing Something: có phong tục gì đó

2. It's not necessary for them to wear a uniform at school in the USA

=> they don't have to wear a uniform at school in the USA

* have + to V: bắt buộc làm 1 việc gì đó

=>CHÚC BẠN HỌC TỐT