"be going to"中的be是助動(dòng)詞,它有am,is,are三種形式,沒有什么實(shí)際意義；to是動(dòng)詞不定式的標(biāo)志詞,標(biāo)志詞后動(dòng)詞用原形.它們?nèi)齻€(gè)總是形影不離,在句中共同表達(dá)"計(jì)劃、打算、準(zhǔn)備去做……"的意思.如：
I am going to sell this old car,and buy a new one.我打算賣掉這輛舊車,然后買輛新車.
用法篇
"be going to"必須與表示將來的時(shí)間信息詞如this afternoon,tomorrow,the day
after tomorrow以及next系列時(shí)間短語等連用.它可表示：
1.事先經(jīng)過考慮、安排近期要做的事情.如：
They are going to the park this weekend.他們打算這周末去公園.
2.根據(jù)目前某種跡象判斷某事非常有可能發(fā)生.如：
What bad weather!It is going to snow tomorrow.多糟的天氣!看來明天要下雪.
另外
1."be going to"的肯定式是"主語 + be going to + do(動(dòng)詞原形) + ...".上面的例句中就有肯定句,再仔細(xì)看看吧!
2."be going to"的否定式是在助動(dòng)詞be后加not,即：主語 + be + not + going to + do +...如：
Peter is not going to make a model ship.彼得不打算做一個(gè)輪船模型.
3."be going to"的疑問式是把助動(dòng)詞be移到句首,即：Be+主語+going to do+...這和be作連系動(dòng)詞時(shí)的用法相似.如：
Are you going to mend his chair soon?Yes,I am./ No,I'm not.你打算馬上給他修椅子嗎?是的,馬上修./不,沒這個(gè)想法.