1.add表示"加；增加",常與介詞to連用,即"add ...to ...","把.加到.中去；往.中加.".例如：
If you add 4 to 6,you get 10.4加6等于10.
Add some hot water if you think the coffee is much too strong.如果你覺(jué)得這咖啡太濃,就加點(diǎn)兒熱水.
2.add表示"補(bǔ)充(說(shuō)道)",即"又說(shuō)；繼續(xù)說(shuō)".例如：
"And I expect your little sister will come,too," added she.她接著又說(shuō)："而且我希望你的小妹妹也能來(lái)."
Mother added that we must get back as soon as possible.媽媽接著又說(shuō)我們必須盡早回來(lái).
3.add to表示"增加；增添",其中to是介詞,后接名詞或代詞.有時(shí)也可用來(lái)表示"(房屋的)擴(kuò)建"或"(書的)續(xù)寫"等.例如：
Each girl present at the party was wearing a flower in the hair,which added to their beauty.參加晚會(huì)的姑娘人人頭上都戴有一朵花,使得她們顯得愈加漂亮.
The soldiers were extremely tired and the heavy rain added to their difficulty.戰(zhàn)士們累極了,而大雨更是增加了他們的困難.
This old house has been added to from time to time.這幢老房子曾一再擴(kuò)建.
Has that book of his been added to later?他的那本書后來(lái)曾續(xù)寫過(guò)嗎?
4.add ...up 表示"把.加起來(lái)"；add up to ...則表示"加起來(lái)總和為.".例如：
Can you add these ten figures up?你能把這十個(gè)數(shù)字加起來(lái)嗎?
All these figures add up to 5,050.所有這些數(shù)字加起來(lái)總和為5,050.
此外,add up (to) 在口語(yǔ)中還有以下兩種用法：
1) 作"含義是；表示；等于；總而言之"講.例如：
His remarks added up to a condemnation of my plan.他的意見(jiàn)總之就是譴責(zé)我的計(jì)劃.
2) 作"有意義；講得通".例如：
I don't think what she said added up at the meeting.我認(rèn)為她在會(huì)上的發(fā)言沒(méi)有意義.