几点了？ (A1)

说整点的时间，用 It's + 数字 + o'clock。

o'clock = 正好整点

It's seven o'clock.
It's twelve o'clock.
The class starts at nine o'clock.
试一试: The clock shows 8:00. ___ eight o'clock. (It's / It has / There is) 答案: It's — 说时间时用 It's 开头：It's eight o'clock。"It has" 和 "There is" 都不是说时间的说法。

整点之后的分钟数，说分钟数 + past + 整点：ten past six = 6:10。

It's ten past six. (6:10)
It's five past nine. (9:05)
It's ten past three. (3:10)
Not "It's six past ten. (for 6:10)" — say "It's ten past six. (6:10)". 先说分钟数，再说 past，最后说整点：ten past six，不是 six past ten。
试一试: The clock shows 4:10. It's ten ___ four. (past / to / after) 答案: past — 整点之后的分钟数用 past：ten past four (4:10)。"To" 用在快到下一个整点的时候；"after" 不能这样用来说时间。

快到下一个整点时，说分钟数 + to + 下一个整点：ten to seven = 6:50。

It's ten to seven. (6:50)
It's five to one. (12:55)
It's ten to five. (4:50)
Not "It's ten past seven. (for 6:50)" — say "It's ten to seven. (6:50)". 当分钟数快接近下一个整点时，数一数还剩多少分钟：6:50 是 ten to seven，不是 ten past。
试一试: The clock shows 8:50. It's ten ___ nine. (to / past / before) 答案: to — 8:50 快到九点了，所以数一数到下一个整点还差多少分钟：ten to nine。"Past" 是用在整点之后的；"before" 不是这样说时间的用法。

:30 用 half past，:15 用 quarter past，:45 用 quarter to。（quarter 是 15 分钟。）

It's half past two. (2:30)
It's quarter past six. (6:15)
It's quarter to nine. (8:45)
试一试: The clock shows 2:30. ___ two. (half past / quarter past / half to) 答案: half past — 2:30 是两点之后半小时，所以是 half past two。"Quarter past" 是 :15，"half to" 不是真正的说法。

问时间时说 What time is it?，也可以说 What's the time?

What time is it? — It's half past four.
What's the time? — It's ten to six.
Excuse me, what time is it?
试一试: You want to know the time. What do you ask? (What time is it? / How time is it? / What is time?) 答案: What time is it? — 问时间说 What time is it? "How time is it" 用错了疑问词，而 "What is time" 问的是时间这个概念，不是问几点。
试一试: The clock shows 7:15. It's ___ seven. (quarter past / quarter to / half past) 答案: quarter past — 7:15 是七点之后十五分钟，所以是 quarter past seven。"Quarter to" 是 :45，"half past" 是 :30。