英語單詞中有哪些表示時間段

時間段：一段時間.如2
days,1
month,3
years,an
hour等
時間點(diǎn)：具體的某個時間.10
o'clock,on
wednesday,last
year,yesterday等
表示時間段的組合：
since+時間點(diǎn).如：I
have
been
a
student
since
last
year.
for+時間段.如：I
have
been
in
the
house
for
7
days.