"Doing" is a plan, and "doing" usually refers to specific actions.

In fact, these two words are very common in daily use, and there is no strict difference. Traditionally, the manufacture of specific things is generally written as "doing", such as "making a table, making clothes, and making a short essay", while abstract words with strong written language, especially those in idioms, are generally written as "doing".

In the sense of "engaging in certain activities", "Left" is mostly used for general activities, and its action is not strong. Its usage is equivalent to "in progress", which means nothing. For example: arranging, planning, interviewing, making promises, reviewing, explaining, communicating, thinking, prompting, modifying, demanding, guiding, commenting, instructing, etc.

"Doing" is mostly used for specific affairs or professional and professional work. For example: working, running classes (holding demonstration or experimental classes), working, doing problems, making medicines (selling medicines), making accounts, making insurance, doing charity (doing charity), advertising, making cards, doing building materials (doing building materials business), doing IT, doing real estate, doing surgery, doing web pages and doing jewelry (doing jewelry business).