语法是不是正确？

虽然我的爸爸大部分时间很活跃，也挺外向，但是计划突然有变的时候，他也有一点内向。他性格开朗而诚实，但是胆小怕事。他有学问，常常跟我分享他的知识。比如说，上个星期我的电脑坏了，他告诉我怎么我能把它修好。一般来说，他挺悲观，而且他思想死板。他用钱很大方，但是用时间不大方。比如说，我们的洗衣机坏了的时候，他给我们买了一个新的，但是我和我的男朋友搬到一起住后，他几个月都没有来过。

Although my dad is lively and extroverted most of the time, sometimes he can be a little introverted, especially when plans change suddenly. He is cheerful and honest, but also a little timid. He is knowledgeable, and always shares his knowledge with me. For example, last week I needed help with my computer because it was broken, and he told me how to fix it. Generally speaking, he is rather pessimistic and his thoughts are inflexible and rigid. He is generous with his money, but not generous with his time. For example, when our washing machine broke, he went to the shop and bought us a new one, but after my boyfriend and I moved in together, he didn’t visit us for several months.