'All you have to do is to telephone this number' OR 'All you have to make is ...'

[Tema]

English Grammar Tests, Elementary Level

ESL/EFL Test #109 "Postcard: Winner", question 4

All you have to ......... is to telephone this number.

(a) make
(b) take
(c) do

English Grammar Tests, Elementary Level

ESL/EFL Test #109 "Postcard: Winner", answer 4

All you have to do is to telephone this number.

Correct answer: (c) do

Your answer was: incorrect
All you have to make is to telephone this number.
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i dont understand please explain me?

Tema

[Mister Micawber]

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One of the important functions of 'do' is its use as a substitute to avoid repetition of a verb or full verb expression: 'I think as you do'.
.
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Native English teacher at Mister Micawber's

[Saneta]

Mr Micawber, shouldn't you write : ,,a full verb expression'', with ''a'' article????? If not, please explain why...

[Mister Micawber]

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It is not necessary to repeat the article.
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Native English teacher at Mister Micawber's

[Saneta]

Mister Micawber, but If I wrote:,,...to avoid repetition of a verb or a full verb expression: 'I think as you do'.'', it would be also good?????

[Mister Micawber]

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Yes.
.
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Native English teacher at Mister Micawber's