yes you can but you must think of insulating the house aswell
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First build the house, then empty the water with the empty bucket if you are in creative. if not, than fill the house with blocks and put a door on the entrance. then go in and destroy all the blocks. you should have a air bubble in the house.
Build a house with some type of floor (not grass or dirt blocks). Trap two villagers in there and trade with them. Put doors on top of building, with blocks on top of the doors. They should start having babies after that. Make sure you have windows.
The spawn area in a server is protected. (A radius of 33 blocks). Have them move more than 33 blocks away from the spawn point, and then they will be able to build.
All you do is right-click, and press B to go to a whole inventory of blocks. Source: minecraft.net/classic/play
To make brick blocks which are used to build houses. You can make brick blocks by put 4 bricks together in a 2x2 square.