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A cuttlefish is a common sea animal with an amazing ability to change appearance. Are there any limits to this ability? Watch this video to find out.

Dolphins are much more intelligent than humans when it comes to fishing: they don’t even need a net. Watch this video to see how they do it.

Cucumber or grapes? What happens when two monkeys do the same task but get 'paid' in different ways? Watch this funny video to find out how monkeys react to inequality.

Do you know how to use phrases like will definitely, be likely to and probably won't to say how sure you are about future events? Test what you know with interactive exercises and read the explanation to help you.

Do you know how to use modal verbs to show how certain you are about past events? Test what you know with interactive exercises and read the explanation to help you.

Do you know how to use phrases like I'll be studying or I'll have finished? Test what you know with interactive exercises and read the explanation to help you.

Do you know how to use the words so and such? Test what you know with interactive exercises and read the explanation to help you.

Do you know how to use question tags like is he and didn't you? Test what you know with interactive exercises and read the explanation to help you.

Do you know how to talk about past habits using used to, would and the past simple? Test what you know with interactive exercises and read the explanation to help you.

Do you know how to use could, was able to and managed to to talk about past abilities? Test what you know with interactive exercises and read the explanation to help you.

Do you know how to use the word enough? Test what you know with interactive exercises and read the explanation to help you.

Do you know the difference between I used to drive on the left and I'm used to driving on the left? Test what you know with interactive exercises and read the explanation to help you.