Excuse me, (am/is/are/do/don't/does/doesn't) you speak English?
"Where's David?" "I (...) know."
What's funny? Why (...) you laughing?
"What (...) your sister do?" "She's a doctor."
It (...) raining.
I (...) want to go out in the rain.
"Where (...) you come from?" "Finland."
How much (...) it cost to send a letter to Germany?
Stephan is a good tennis player, but he (...) play very often.