1. Lan often attends english speaking club to practice speaking english (so that )
=>Lan often attends English Speaking Club so that she can practice speaking English.
2. he stood on the chair to see better (in order to)
=>He stood on the chair in order to see better.
3. please shut the gate for the cows not to get out of the cowshed (so that )
=>pleased shut the gate so that the cows can't get out of the cowshed
4. the boy tiptoed into the room not to wake every body up (so that )
=>The boy tiptoed into the room so that he wouldn't wake everybody up.