There are far too many combinations to list them all. Here's a mishmash.
Combinations Which Start With A Hand Attack
(These five combos I've considered fundamental for many decades)
Jab-> R Round Kick
Jab-> Cross-> Lead Round Kick
Jab-> Cross-> Hook-> R Round Kick
Jab-> Cross-> Lead Round Kick
Jab-> Cross-> Hook-> R Round Kick
Jab->L. Round Kick
Jab->Cross->R. Round Kick
Hands Combinations
Jab->Jab & Slip->Cross *example
Jab-> Cross-> Side Step L. Hook -> Tyson Step -> L. Hook *example
Jab-> L. Angle Step Slip & Cross *example
Hands to Legs Combinations
Jab-> Body Cross-> Hook-> R. Round Kick *Example *Without the kick
Body Jab->Cross->L. Round Kick
L. Long Hook->R. Uppercut to Body->L. Shovel Hook to Body *example
L. Step Cross-> R. Foot Full Angle Step (Shifting) -> Cross (other hand) -> L. Pivoting Hook (Check Hook) -> R. Round Kick *example
Combinations Which Start With A Kick
L. Push Kick-> R. Round Kick *Example
L. Push Kick->Cross->Hook->R. Round Kick
L. Push Kick->R. Knee->R. Elbow *Example
Missed Or Faked Round Kick -> Side Kick
Rear Leg Missed/Faked Round Kick->Side Kick *fightTIPS
Rear Leg Missed/Faked Round Kick -> *Spinning Backfist/Elbow
Notes:
V.L.C. -Vertical Line Change
L.F. - Lateral and Angled Footwork