I cooked dinner for myself.
我为我自己做了晚餐。
I can handle this by myself.
我可以自己处理这件事。
I bought a gift for myself.
我给我自己买了一个礼物。
I need some time for myself.
我需要一些时间给我自己。
I introduced myself to the group.
我向小组介绍了我自己。
I often talk to myself.
我经常和我自己说话。
I made a promise to myself.
我对我自己做了一个承诺。
I wrote a letter to myself.
我写了一封信给我自己。
I taught myself to play guitar.
我教我自己弹吉他。
I challenged myself to run a marathon.
我挑战我自己跑马拉松。
by myself
独自地；独立地
introduce myself
自我介绍；介绍自己；自己介绍自己
all by myself
独自；我自己
