we will go shopping with our friends this sunday evenings
→ thì TLĐ : S +will+ V nguyên mẫu
do you sometimes go swimming at the weekends ?
→ thì HTĐ nghi vấn : do / does + S + V nguyên mẫu
→ dấu hiệu nhận bt : sometimes
how often do their workers go to work by bus ?
→ → thì HTĐ nghi vấn : do / does + S + V nguyên mẫu
→ dấu hiệu nhận bt : often
i don't know that he is a doctor
→ thì HTĐ phủ định : S +don't / doesn't + V nguyên mẫu
did her brothers see this football math on TV last night
→ thì QKĐ nghi vấn : did + S + V nguyên mẫu
→ dấu hiệu nhận bt : last night