HI 高枫 No, "I have been considering the thesis is excellent?" is not grammatically correct. It is possible for the two words, consider and think, to have the same meaning, but the sentences are constructed slightly differently. a) to 'think about' something can be to 'consider' something b) to 'think that' something can be to 'consider s/t to be' something examples: a) I have been considering this thesis; it is excellent a) I have been thinking about this thesis; it is excellent b) I think this thesis is excellent b) I consider this thesis to be excellent a) and b) together: I have considered this thesis and I think it is excellent. a) and b) together: I have been thinking about this thesis and I consider it to be excellent. I am sure there are plenty of other ways to say it, but hopefully this highlights the difference. There are other meanings for both 'think' and consider', but they are not really relevant to the sentence you asked about.

Think : To have or formulate in the mind To reason about or reflect on; ponder . example : Think how complex language is. Think the matter through Consider : To think carefully about (a problem or decision) To esteem; regard example : Corsica is well worth considering for those seeking a peaceful holiday in beautiful surroundings

Maybe, but I am not sure. It sounds unusually for me. Consider has several meanings 1. to think about something carefully, especially in order to make a decision. 2. To think of sth or sb in a particular way. 3.To look carefully at sth. 4.to think about feelings of people and be influenced by them in the future You should consider other people before you act. He stood there, considering the painting