Why does not formaldehyde take part in aldol condensation?

Aldol condensation is:

Assertion : All aldehydes donot take part in aldol condensation. Reason : In th aldol condensation, carbanion is generated by the abstraction of alpha -H atopm by the base.

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In the compound CH_(3)CH_(2)COCH_(3) , the number of hydrogen atoms taking part in aldol condensation is :

Does formaldehyde undergo aldol condensation ? Justify your answer.

Does formaldehyde undergo aldol condensation ? Justify your answer.

Why Trimethyl acetaldehyde does not give aldol condensation ?