1. My mother usually washes the dishes and vaccum the floor. She usually do chores related to food.And my father irons some  clothes. 

=> My mother usually washes the dishes and vacuums the floor. She usually does the chores related to food. And my father irons some clothes. ​

2. We investigated it.

•  Your sentence is okay and this is another way of saying it.

​=> We conducted a survey.

3. This performance starts at 7.  ✅

​

4. She stopped yelling. ✅

​• Corrected : The sentences are corrected grammatically.​