决定做某事 meaning in Chinese

decide to do sth
determine to do
settle to do sth

Once i decided to do something , i just do my best
当我决定做某事的时候，就尽力去做好它。
If he is determined to do something , nobody can stop him from doing so
如果他决定做某事，任何人也无法阻止他去做。
His face was clam and serious ; he looked like a man who had decided to do something
他的脸是平静与严肃的，他看起来像是一位已经决定做某事的人。
The reasons / factors / causes for my love ( of . . . ) / interest ( in . . . ) / determination ( to do sth . ) / objection ( to sth . ) / . . . are varied and individual
我喜欢… /对…感兴趣/决定做某事/反对某事有不同的个人的原因。