Can you drive?
She can speak four languages.
I can't read that sign over there - what does it say?
It was difficult to join two words of English correct[l]y. Now I can speak. (Skills for Life (Entry 1); A1; Somali)
If you see Adrian, can you tell him I'll be in London next weekend?
Can I have a glass of water?
So please, can you make me a big sala[d]? (Skills for Life (Entry 1); A1; Slovak)
Can I help you with those bags?
Can I help you? (Skills for Life (Entry 1); A1; Lithuanian)
You can get stamps at the post office.
You can make a quick snack, for example a sandwich. (Skills for Life (Entry 1); A1; German)
Can I go now?
You can't park here.
And if you want, you can bring pencils or pens. (Key English Test; A2; Catalan)
You can't possibly be hungry already!
Can you believe it?
In fact, the highest tree there is almost 30 met[er]s tall! Can you believe that? (Preliminary English Test; B1; Portuguese)
She can be really rude at times.
When you choose to travel by car there can be a lot of traffic. (First Certificate in English; B2; Dutch)
Smoking can cause cancer.
The nights can be very cold.
But overworking is also bad. It has lots of disadvantages, and can cause lots of problems, including health problems. (First Certificate in English; B2; Portuguese)