請幫忙改成正確寫法 If I came up with a new way of teaching a language, and someone presented it as their own, there will not be much I could do.?

可有以下寫法：
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If I came up with a new way of teaching a language and someone presented it as his own, then there would not be much that I could(can) do.

If I came up with a new way of teaching a language and someone then presented it as his own, there would not be much that I could(can) do.
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多一點文法上的解釋：-
(1) a) "someone" presented it as "his" own
-- "someone" 解作「一人」∴ 用 "his"
b) 如果想說「多於一人」/ 「一組人」,可寫 :
-- "some people" presented it as "their" own
-- "another group" presented it as "his" own (group -- 一組人, ∴ 單數)
(2) there "would" not be much that I could(can) do
-- 用 "would" 以表示「沒可能發生」的事!
-- I could do :也可用 I can do (如果想表示的是「現代式」,即 現時沒有什麽可做。)
(3) . . ."and" . . . : "and" 之前不需用 " , "

If I came up with a new way of teaching a language, and someone presented it as their own, there will not be much I could do.

括符內文字為修正處：

If I came up with a new way of teaching a language, (but) someone presented it as (his/her) own, (which) will (be not that much that I could tolerate)..

If I came up with a new way of teaching a language, and someone presented it as their own, there will not be much I could do.
Amendment: Supposed I found a new method of teaching language and someone plagiarizes it for one's presentation, then there won't be much I could do. Yip

The type 1 conditional should be used to refer to a possible condition and its probable result.

改寫成:
If I come up with a new way of teaching a language but someone presents it as their own, there will not be much I can do.

我覺得可以改成 If i came up with a new way of teaching a language/languages, but someone presented it as their own, it won't be so much things that i can do.