英文need這個單詞既是名詞,又是動詞。作動詞時是情態動詞也是實義動詞。作動詞的主要用法是以下四種,如果你能分清楚,它的常見用法你就掌握了。
need當情態動詞
第一種:need do sth
Lily need go there.
Lily needn't go there.
(情態動詞時,否定 need+not)
need為情態動詞,用法基本同can,沒有第三人稱單數現象。
need當實義動詞
第二種:need sth
They need some pears.
The boy needs the toy car.
第三種:need(sb) to do sth
Grace needs to go there.
She doesn't need to go there.
(實義動詞時,否定藉助動詞+not,有第三人稱單數現象。)
She needs me to do it.
第四種:need doing sth
此時是主動表被動意義=need to be done。
The desk needs painting. = The desk needs to be painted.
注意need當情態動詞的一種用法和當實義動詞的三種用法。