列出三种常用的英语语法错误，并且用一个例子来说明每个错误。
1. 主谓不一致：主语和谓语在人称、单复数上不一致。
   例子：My sister and I is going to the mall. (正确写法：My sister and I are going to the mall.)

2. 没有使用正确的时态：用词不当导致时态错误，如将现在时用于过去动作。
   例子：Yesterday, I woke up at 7:00am, ate breakfast, then I walk to school. (正确写法：Yesterday, I woke up at 7:00am, ate breakfast, then I walked to school.)

3. 错误的词序：将句子中的词顺序排列不当导致意思模糊或不正确。
   例子：Went I to the park yesterday with my friends. (正确写法：I went to the park yesterday with my friends.)