1. will do 是表意願eg. Now if you will take off your clothes, we will fit the new clothes on you in front of the mirrow.
2. be going to 表將來 a) 主語的意圖，即將要做某事eg. What are you going to do tomorrow? b)計劃，安排要發生的事eg. The play is going to be produced next month. c)有跡象要發生的事eg. Look at the dark clouds, there is going to be a storm3.be to do 是指按計劃或正式安排將發生的事eg. We are to discuss the report next Saturday.從上面我們可以看出will 一般表意願be going to do 表將來，含有主觀的打算或計劃be to 表示客觀安排或受人指示而做某事現再就be going to do 和 be to 舉兩例：i am to play football tomorrow afternoon. (客觀安排，如這兒有場比賽定在明天下午，不去不行，不能由主觀決定)i"m going to play football tomorrow afternoon. (主觀安排，如我只是和朋友約了明天下午踢足球以消遣時間，可去可不去，可由主觀決定)
都是用來表示將來時，區別如下：
1. will do 是表意願eg. Now if you will take off your clothes, we will fit the new clothes on you in front of the mirrow.
2. be going to 表將來 a) 主語的意圖，即將要做某事eg. What are you going to do tomorrow? b)計劃，安排要發生的事eg. The play is going to be produced next month. c)有跡象要發生的事eg. Look at the dark clouds, there is going to be a storm3.be to do 是指按計劃或正式安排將發生的事eg. We are to discuss the report next Saturday.從上面我們可以看出will 一般表意願be going to do 表將來，含有主觀的打算或計劃be to 表示客觀安排或受人指示而做某事現再就be going to do 和 be to 舉兩例：i am to play football tomorrow afternoon. (客觀安排，如這兒有場比賽定在明天下午，不去不行，不能由主觀決定)i"m going to play football tomorrow afternoon. (主觀安排，如我只是和朋友約了明天下午踢足球以消遣時間，可去可不去，可由主觀決定)