Common Mistakes : insist

verb

.BAD: The porter insisted to help us with our baggage
.GOOD: The porter insisted on helping us with our baggage
.GOOD: The porter insisted that he (should) help us with our baggage

: insist on (doing ) sth
.He insisted on paying for the meal himself

: insist that sb (should ) do sth
.He insisted that he (should) pay for the meal himself