Save

[Xinfu]

For natives:

Could I use from? (or leave it blank?)

-Please send out the message, and save your teacher __ letters. (=save him the effort of writing letters to tell others.)

[Rusty]

Do not leave it blank.

In the blank, write 'writing' or the more complete 'the effort of writing'.

[Xinfu]

Thanks. Is

-Save him writing...

the same as

-Save his writing...

[wrholt]

Thanks. Is

-Save him writing...

the same as

-Save his writing...

No.

"Save him writing" = "save him (the effort of) writing".

"Save his writing" = "save what he wrote".