查了一下"，doing"的用法，学问还真多：
the "comma + ing" modifier should only be used when:
(A)it MODIFIES?THE ENTIRE ACTION?of the?preceding clause, and it?APPLIES TO THE SUBJECT of that clause;
AND
(B)one of the following is true:
(1) the "ing" action is SIMULTANEOUS with, and SUBORDINATE to, the main action;
-?I ran?down the sidewalk,?flapping?my arms wildly.
(2) the "ing" action is a DIRECTAND IMMEDIATE CONSEQUENCE of the main action.
- I got a 100 on the most recent exam,?bringing?my average up to 91.
--
COMMA + -ING clauses are automatically attributed to the SUBJECT of the preceding clause.
Also note that it applies not only to that subject, but to the entire action of that clause (this is what makes it"adverbial").
1) when you use a COMMA -ING modifier after a clause**, you should actually satisfy TWO requirements:
-- the modifier should modify the action of the preceding clause, as you have stated;
AND
-- the?subject?of the preceding clause should also?make sense?as the agent of the -ING action.
Examples:
Joe?broke?the window,?angering?his father. -->this sentence makes sense, because it correctly implies that?Joe "angered his father".
The window was broken?by Joe,?angering?his father.--> this sentence?doesn't make sense, because it implies that?the window(i.e., not Joe himself) angered Joe's father.
My brother?tricked me,?disappointing?Dad --> implies that dad is?disappointed in my brother for tricking me?(and?not necessarily disappointed in me for being tricked).
I?was tricked by my brother,?disappointing?Dad --> implies that dad is?disappointed in me because?I fell for my brother's trick?(and?not that he's disappointed in my brother for tricking me).
来源：
https://forum.chasedream.com/thread-881592-1-1.html厉害👍
谢谢