2. It's been six years since we last saw each other, you know.
你知道,自從我們上次見面以來已過去6年了。
It is / has been+一段時間+since +過去式表示“自從……至今已經多久了”。since“自從……以來”,表示事情持續的起點。
①以過去的時間點為起點,持續到現在,用現在完成時;
②從比過去更早的時間持續到過去,用過去完成時;
③從過去持續到將來,用將來完成時。
It's three years since he left for Australia.
=Three years have passed since he left for Australia.
自從他去澳大利亞以來已三年了。
句型探究
It be+時間+conj.句型
①It is / has been+時間段+since+一般過去時(從句中的動作是非延續性的)，意為“自從……至今已經多久了”。
It is (has been) ten years since I joined the army.
我參軍已經10年了。
②It is / has been+時間段+since+一般過去時(從句中的動作是延續性的)，意為“不做……至今已經多久了”。
It is ten years since I smoked.
=It is ten years since I stopped smoking.
我戒煙10年了。
③It will(won?t)be+時間段+before+一般現在時,意為“還要過……之后才……”。
It will be ten days before I return home.
要過10天我才能回家。
④It was+時間段+before+一般過去時,意為“過了……之后才……”。
It was ten years before he found his lost son.
過了10年他才找到了他失蹤的兒子。
⑤It is / was +時間點+when+…,意為“做某事是在某個具體的時間” 。
It was noon when the accident happened.
事故發生時已是正午。

3. What's the climate like?
氣候怎么樣？
What is...like?意為“……怎么樣？”這種句型主要用來問人或事物的特征。
What is the weather like in Taiyuan?
太原的天氣怎么樣？
詢問某人或某事的狀況、特點還可以使用下列句型:
What be +主語+like?
=How be +主語？
What do you think of...？
=How do you like / find…
What do/does+主語+look like?
某人長相怎么樣？
What's your English teacher like?
你的英語老師人怎么樣(或長得怎么樣)？
How do you like the dish?
這菜怎么樣？