Question

if it is sunny tomorrow，i would go with you. 这句话对吗？

if it is sunny tomorrow，i would go with you. 这句话对吗？如果我想表达，就算是天晴，我还是不那么坚决的语气。一定要说 will 吗？

Answer 1

不对，前面if是一般现在时，后面主句应该是一般将来时。改为：
if it is sunny tomorrow，I will go with you. 如果明天天气晴朗，我就和你一起去。

Answer 2

对的，而且你的理解也是对的。这是符合语法的，但是我不能说你在考试中可以这样写，你平时说出来是完全正确的，因为不能确保你的老师会赞同这种先进的表达方法，你也可以说，
i will probably go with you.但是在我听来你说的这句话更自然。
"if it is sunny tomorrow, i will go with you", 1st conditional.
"if it is sunny tomorrow, i would go with you", this is 1st conditional that just emphasizes the possibility that the action would be taken place. a more progressive version.
"if it were sunny tomorrow, i would go with you", this is a 2nd conditional.

Answer 3

这句话有语法错误，根据主将从现的语法规则，应该是I will go with you，而不是would

Answer 4

不对，不对，不对。