the first two are OK the third is incomplete, perhaps: He was the first person developing a modern hel i copter while we tried the same.
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Nona The BritThe first two are ok. The third is not feasible even with MH's addition.Sorry, but I just can't understand. I thought developing was just a present participle abrreviated from who developed in grammar aspect. I guess most of the learners would be as confused as I.
Goodman
He was the first person to develop a modern helicopter.
He was the first person developing a modern helcopter.
This goes back to the same question discussed many times before. When can we use infinitive and geru
Goodman
I guess the rule of thumb is that when you have a construct with “someone is the first” the form should be likely infinitive.
However, nothing is absolute and only the context will determine the proper form of the verb.
e.g. My brother was the first in our family to achieve