• 将句子里的 be 动词、助动词 have/has/had、情态动词 should/could/might 等提到句首。若没有的，在句首加 do\did\does。
• 现在_一般 : ① Am/Is/Are +主+...？; ② Can/May 等 +主 do...？; ③ Do/Does +主 +do...?
• 过去_一般 : ① Was/Were +主+...？; ② Could/Might 等 +主 do...？; ③ Did +主+do...?
• 将来_一般 : ① Shall/Will +主+ do...?; ② Am/Is/Are +主 going to do...？
• 过去将来_一般 : ① Should /Would + 主+ do...?; ② Was/Were +主 going to do...？
• 现在_进行 : Am/Is/Are +主doing...?
• 过去_进行 : Was/Were +主doing...?
• 将来_进行 : ① Shall/Will +主+ be doing...?; ② Am/Is/Are +主 going to do...?
• 过去将来_进行 : Should/Would +主+ be doing...?
• 现在_完成 : Have/Has +主+done...？
• 过去_完成 : Had +主+done...？
• 将来_完成 : Shall/Will +主 have done...?
• 过去将来_完成 : Should/Would + 主 have done...?
• 现在_完成进行 : Have/has +主+ been doing...?
• 过去_完成进行 : Had +主+ been doing...?
• 将来_完成进行 : Shall/Will +主 have been doing...?
• 过去将来_完成进行 : Shall/Will +主 have been doing...?
• 通常情况下： shall 与第一人称主语搭配，will 各种人称皆可