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Can I say,

There are a couple walking at the beach.

A pair of couple was walking along the beach.

Two couple is walking by the beach.
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Hi Vincent,
To start with, consider this.
a couple = 2
a pair of couples = 4
two couples = 4

So, do your words reflect your meaning?

Best wishes, Clive
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Vincent TeoThere are is a couple walking at on the beach.

The other three are correct.
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So, are there correct?

There are a couple walking at the beach.

The couple is walking on the beach.

A pair of couples were walking along the beach.

Two couples are walking by the beach.
 A Cornish Pasty's reply was promoted to an answer.
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Thanks. But, Couple = 2 people. In my opinion, it should be in plural , right?

A couple are walking to the beach.