The reason I don't like maths is because of the teacher.

In England it is perfectly fine to say 'maths' without the apostrophe. e.g. her mother was a maths teacher

Never use the word "maths". Outside of a few very specific cases, its always "math" or "math's" (possessive). However, we do not normally refer to "math" as having possession of "lesson". Rather, "math" would be used as an adjective to describe "lesson". So don't use "math's lesson" either. There are a few things going on here. First, a lesson is a single event. "The math lesson" occurs only once and refers to a specific "math lesson". ("A math lesson" also occurs only once, but is not specific about which "math lesson".) You could say "I am not in love with the math lesson because of the teacher," or "I do not love the math lesson because of the teacher." However, these sound strange. Something you currently love or do not love needs to currently exist. So, unless the single math lesson is currently taking place, these statements would be incorrect. You could say "I am not in love with this math lesson because of the teacher," or "I do not love this math lesson because of the teacher." "This" refers to the specific lesson occurring right now. You could also say "I am not in love with the math lessons because of the teacher," or "I do not love the math lessons because of the teacher." These are fine because they refer to lessons which occurred in the past and which will occur in the future, as well as any lesson occurring now. You could also refer to the past, and say "I was not in love with the math lesson because of the teacher," or "I did not love the math lesson because of the teacher." Again, these sound a little unusual, but they are correct. So, to summarize "This" instead of "the" - Only referring to the lesson that is taking place right now. "was not" or "did not" - Refers to a lesson in the past. "lesssons" instead of "lesson" - Refers to any lessons in the past, now, and in the future. Never use "maths". Avoid using "math's lesson".

都不太清楚 你想说 a) ‘因为老师我恨数学’ 还是 b)‘我喜欢数学但是原因不是因为老师好’？？ If a), then you could say "I hate/don't like maths because of the teacher" or b) I love maths, but mot because of the teacher"