help me get a good grade for my test.

[sykim99]

A pulse of ultrasound is aimed at the metal and any flaws reflect the pulse, allows their size and location to be determined.


THe above underlined word "allows" should be corrected to "allowing",my teacher said.
Is it a strange sentence if I stick to "allows"?

[Raymott]

A pulse of ultrasound is aimed at the metal and any flaws reflect the pulse, allows their size and location to be determined.


THe above underlined word "allows" should be corrected to "allowing",my teacher said.
Is it a strange sentence if I stick to "allows"?

"Allows" is not grammatical. Your teacher is right.
Flaws reflect the pulse, allowing their size and location to be determined.
Flaws allow their size and location to be determined by reflecting the pulse.

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