I wouldn't say that's totally true.
很多人在表达否定观点的时候,都会用"I don't think…",比如这一句就可以说"I don't think that's totally true."但是如果用"I wouldn't say",语气明显缓和了下来,而且对话两人很可能是好友的关系,在平时闲聊的时候,语气最好不要显得那样生硬.
you know, usually the woman is in her thirties and she is a left girl.
这里的left girl,就是指现在很流行的"剩女"这个词了吧.
You have a point here, but I believe some mixed marriages are based on true love.
you have a point here是很地道的表达法,意思是"不错,你的话有理,你说的有道理".