months at level 幾個月的水平

years at

level 年的水平

two years old與two-year-old的用法區別

放在名詞前時(就是作定語時），用two-year-old, 但要注意其中的名詞必須用單數； 其他情況下用two years old, 可以以此類推。如:

He is a two-year-old child.

Her two-year-old daughter is in hospital.

I know the sixty-year-old man.

The child is two years old.

He is a child about two years old.

He is going on eighteen years old.

The baby is two months past two years old.

months,years,ages,前面用for還是since

用for,for用於時間段

since用於具體時間

years,month,ages都是時間段