The build this bridge.

 -->this bridge.........is bult...............................

Give me a cup of coffee, or I'll be sleepy

---> If...........you don't give a cup of coffe,i will be sleepy..................................................

We began talking to her a long time ago

---> We have..........talked to her for a long time...................................

He is writing a letter to his friend at the moment

---> A letter....is being written his friend at the moment..............................................

We last saw him 3 days ago

---> The last time...............................................