When doing and when you do are always the same

Not always the same, the former indicates doing something often, while the latter means doing something sometimes.

The main grammatical function is different, the former can be the subject, the object,Expression, the latter can only be used as a temporal adverbial.

when to do

infinitive.

It means "when you are going to do something".

when doing

The present participle in .

It means "when I am doing something".

Usage: When can be used as a subordinate conjunction, leading an adverbial clause, and "dang..." when expressing time, in....When "solution; When expressing a condition, it is used as an "if, if" solution; When expressing contrast, it is used as a "since, take into account" solution. When the subject of the clause guided by when is the same as the subject of the clause, the subject is often used as a verb.

or auxiliary verbs are omitted, leaving only substantive verbs.

or a predicate, or rephrased as a phrase.

When the adverbial clause of time guided is in the simple present tense.

Instead of the future tense, use the present perfect tense.

In place of the future perfect tense.

whendoing

As. things at the time.

As. when

doingthe

exam,we

should

becareful.Actually, it's over here.

To put it all like this, when

weare）

doingthe

exam,we

should

becareful.

And whento

Do when to do it. Such as she

willtell

youwhentodoit.

1. When doing usage.

When the subject of the clause and the subject of the clause are the same or the same person, the predicate verb of the clause is in the form of be verb + doing, and the subject and be verb of the clause can be omitted, that is, when doing sth is used as ......Things to do, such as:

when doing the work,we should be careful.

To put it more completely, when (we are) doing the work, we should be careful

When we work, we have to be careful.

2. When followed by the usage of do:

1) When guiding an adverbial clause, usually the following slag should be followed by a clause, and when it is in the general present tense, use the do verb form. As.

when you do your homework，you should be careful.

When you write your homework, you have to be careful.

2) When leading a question sentence, it is generally present tense.

when do you do your homework？

When do you write your homework?

When the subject of the clause and the subject of the clause are the same or the same person, the predicate verb of the clause is in the form of be verb + doing, and the subject and the verb of the clause can be omitted, that is, when doing sth refers to the ......When doing the work, we should be careful

When the first and last two are single acts, when is usually used. And the two single actions before and after usually occur one after the other.

Example: I picked up the phone when it rang

When it rang, I picked it up.

Description: There are two single behaviors before and after, and it happens immediately after the ringing, and this side uses when.

Example: when i get home, i take off my shoes

When I get home, I slip on my shoes.

Note: The front and back are not in progress, so use when.

while when, a continuous tense, a single act. (The ongoing tense can be preceded by while or when).

If the two sentences before and after are respectively an ongoing tense and a single action, then the ongoing tense can be preceded by while or when.

e.g. he called while when i was sleeping

He called while I was sleeping. (While or when is acceptable here).

Example: i got into an accident while i was driving home

I had an accident while driving home.

Example: i got into an accident when i was driving home

I had an accident while driving home.