'用于现在完成时的句型 1）It is the first/second time…. that…结构中的从句部分，用现在完成时。It is the first time that I have visited the city.It was the third time that the boy had been late. ...'

'比较过去时与现在完成时 现在完成时可表示持续到现在的动作或状态，动词一般是延续性的，如live, teach, learn, work, study, know. 过去时常用的非持续性动词有come, go, leave, start, die, finish, become...'

'Mom: You're not going anywhere, Sam. Where's that shopping list?Kim: I have it, Mommy. Umm, we need two heads of broccoli, a bag of carrots...?Mom: Let's see if any of that is organic. Oh, great...'

'The next day; on the way to Timpanogos CavesJun: Look at those guys rock climbing! They're so fast! Look, lots of people are watching!Bob: Good eye! Let's pull over and watch, too. Jun: I took a ...'

'A few hours later; Jun is looking sick on the car ride backLisa: What's wrong? You don't look too happy.Jun: I have the worst headache!Lisa: Let me open the window for you. Maybe some fresh air w...'

'Dan, Morley and Kathy finally arrive at the Naruwan HotelMorley: That was one doozie of a trip.Dan: I'm beat. Let's get a room and put our bikes away for good.Morley: I'll rent a scooter so we ca...'

'The next day, on their way to Pahsien CaveMorley: So what's the story behind this cave we're going to?Kathy: Actually, it's a bunch of caves. Eight of them have temples dedicated to eight differe...'

'Morley: Let's visit all eight caves.Kathy: Actually, Dan and I should skip one of them. The temple for Lu Dongbin is bad for couples.Morley: But I thought you said these gods just helped people. ...'

Dan and Kathy take Morley to Shanhsientai IslandDan: You can get tons of pictures around this weird bridge, Morley.Morley: I see what you mean. The arc...

Morley: Kathy, is this place at all related to Pahsien Cave?Kathy: Yes, it is. Three of the gods from the caves supposedly came here as well.Morley: An...