Wei: What are flapjacks? Paul: Pancakes. And they do know how to make those. Wei: But I don't like this kind of syrup. Paul: Don't worry. They'll give you butter on top, or margarine instead. Wei: What's with the "Steak & Eggs"? People in America eat steak for breakfast? Paul: Of course. Beef. It's what's for breakfast. Wei: Ha-ha. I thought it was "Beef. It's what's for dinner." Paul: In America, it's beef three meals a day.
Every summer more than 100 species of birds migrate from the northern hemisphere to South African shores. The most common migrants are the waders of the sandpiper family, but they also include other birds ranging in size from herons to shrikes. The Benguela Current along the southern and southwestern coastline supports a rich supply of fish that in turn attracts scores of seabirds, such as the large flocks of cormorants which fly in characteristic V-shape formation. Spectacular colonies of Cape gannets can be seen at Lambert' s Bay and on small islets such as Bird Island on the west coast.
1) may(might) have + done sth, can (could) have + done sth 表示过去，推测过去时间里可能发生的事情。 Philip may (might) have been hurt seriously in the car accident. Philip can (could) have been hurt seriously in the car accident.
2) must have +done sth，对过去时间里可能发生的事情的推测，语气较强，具有"肯定"，"谅必"的意思。 ---Linda has gone to work, but her bicycle is still here. ---She must have gone by bus.