21、level2-unit1-part4 vocabular

it's morning.
people get up in the morning and the day begins.

it's afternoon
people eat lunch in the afternoon.     /ði:/ 

it's evening.
people eat dinner in the evening.     /ði:/ 

it's night.
at night people go to bed.

it's day time.
it's light during the day because the sun is up.   (/bɪ'kɔz/  中的ɔ要弱读成ə）白天很亮，因为太阳升起来了。

it's night time.
it's dark at night because the sun is down.晚上天黑是因为太阳下山了。