Learn Swedish: Jag skulle ha gett honom rådet om han hade tvekat. - I would have given him the advice if he had hesitated.

This sentence uses the unreal past conditional structure. The main clause describes the imagined result using skulle ha + the supinum (the 'have done' form) verb, gett. The condition clause uses om (if) followed by the past perfect: hade + the supinum verb, tvekat.

Is it possible to drop the word ha in this sentence?

Yes! In spoken and informal Swedish, it is very common to drop ha after words like skulle, kunde, and borde. You will very often hear or read Jag skulle gett honom rådet.

What happens to the word order if we start the sentence with the om clause?

If you flip the sentence, the main clause must still follow the V2 (verb-second) rule. Because the entire om clause counts as the first block of information, the verb skulle must come immediately after the comma: Om han hade tvekat, skulle jag ha gett honom rådet.

Why does the sentence use the definite form rådet?

In English, 'advice' is uncountable, so you usually just say 'given him advice.' In Swedish, ett råd is a regular countable noun. Because the speaker is referring to a specific piece of advice, it takes the definite ending -et to become rådet (the advice).