Don't waste your chance.
チャンスを逃がすな
Don't waste your energy (in) arguing with him.
彼にはかまうな
Don't worry about a thing.
何も心配しないで
Don't worry about it.
そのことは気にするな
Don't worry so much.
そんなに心配するな
Don't worry, you'll do fine.
心配するな,君ならちゃんとやれるさ[きっと大丈夫]
Don't you dare come back.
絶対に戻ってくるな
Don't you ride that bike!
その自転車に乗らないでね
donate $1,000 to an orphanage
孤児院に1000ドル寄付する
donate [give] blood
献血する