Grammar fix

fully support

completely help

To give someone or something your complete help, encouragement, or agreement, without holding back.

collocationB2common

Hear it in context

Notice where the phrase sounds natural.

I fully support your decision to study abroad.daily life
In my opinion, I fully support the idea of providing free public transport because it helps reduce pollution and traffic.IELTS speaking

Pattern: fully support + noun/pronoun

WrongI fully support to your decision.

RightI fully support your decision.

'Support' takes the object directly — no 'to'.

Patternfully support + noun/pronoun

Choose the version that sounds natural in speech.

Stiff I shall lend my unreserved endorsement to the plan.

Natural I fully support the plan.

'Lend my unreserved endorsement' is corporate; 'fully support' / 'fully behind' is natural.

Words that usually travel with it.

'Support' alone means to help, but 'fully support' is stronger and means you completely agree or help, with no doubts.