1. When talking about duration which is still ongoing:
【1】verb + obj. + verb. + 了+ duration + 了
现在我学习中文学习了快一年了。 (快一年 is more often used for almost a year).
【2】 Subject + duration +没有 + verb + obj. + 了
我好久没有学习法语了。
【3】When talking about HOME, we don't use “的” between pronouns and 家.
For example:
我家,你家,我们家,你们家,他们家。。。。
【4】When using "很多”, usually we don't need "的“after that.
很多语言,很多人。。。
【5】When talking about continue to study, we use "继续学习“
我还很需要继续学习这些语言。
【6】When using "尽管”,usually we need to use a specific adverb in the second sentence, like "还是“: 尽管会犯一些错误,我还是觉得。。。。
Hope it helps!!
等我把法语和意大利语学好以后,我会学习葡萄牙语和西班牙语:)