在以下幾種情況下可以must,can,will,should,包括他們的過(guò)去式后面都用be而不用am is are,例如You must be a student.I can be a superstar .比如說(shuō)：She is a doctor.He is gong to the bookstore.Yes,l like spring best.Yes,today is June 1.問(wèn)句是什么？還有這個(gè).Yes,he usually goes to work by bike.I go to school on foot every day.問(wèn)句又是什么？求解我快要期末考試了，就在明天！總的來(lái)說(shuō)，be動(dòng)詞出現(xiàn)一般都用be動(dòng)詞來(lái)提問(wèn)（排除你還沒(méi)有學(xué)習(xí)的正在進(jìn)行式）你問(wèn)的問(wèn)題的問(wèn)句Is she a doctor?Is he going to the bookstore?這樣的句型只用把BE動(dòng)詞提前發(fā)問(wèn)就行了。Do you like spring best?Do you know what day today is?這樣的句型一般是要用Do來(lái)進(jìn)行發(fā)問(wèn)，第二句可能有些麻煩不知道你們學(xué)了what句型發(fā)問(wèn)沒(méi)有有yes或者no的回答句型一般都用Do這樣的句型Does he usually go to work by bike?How do you go to school ?這里需要注意的是單三和how的意義和用法，不好用一兩句來(lái)概括。比較簡(jiǎn)單的是單三形式Do要變Does來(lái)提問(wèn)，用法和上面一樣。下面這句就要看具體情況了，一般這種有實(shí)義動(dòng)詞提問(wèn)的要用what，how，when，who，which來(lái)提問(wèn)，你找相關(guān)方面的書看看就好了，小學(xué)英語(yǔ)還是比較少這樣的問(wèn)法，一半就那么幾句，掌握了就好了。