Start doing sth. Start doing sth. discrepancy

You can only do sth 1 with start. In the following cases, the subject is things, not people. For example, ice began to melt. 2.start is used in the continuous tense, for example, Mary begins to do housework. 3.Start is followed by words indicating mental state or mental activity. I began to understand this lesson. 4. Used to describe weather changes. For example, it began to get dark before you knew it. 5. Emphasize the actual beginning of the action. When she entered the room, we began to laugh. Other situations can be interchanged.