important – more important – the most important
little – less –least
cheap-cheaper – the cheapest
popular – more popular – the most popular
happy-happier – the happiest
hot – hotter –the hottest
busy-busier – the busiest
much-more-the most
bright – brighter – the brightest
empty-emptier – the emptiest
bad-worse – the worst
large-larger – the largest
clever- cleverer-the cleverest
thin-thinner – the thinnest
kind – kinder- the kindest
late-later – the latest
expensive – more expensive – the most expensive
useful – more useful – the most useful
narrow – narrower – the narrowest
few- few – the fewest
wide – wider –the widest
dirty – dirtier – the dirtiest
difficult – more difficult-the most difficult
nice – nicer – the nicest
safe –safer –the safest
early – earlier –the earliest
exciting – more exciting –the most exciting
good –better –the best
heavy-heavier- the heaviest
The correct variant to complete the sentence is:
The lesson had already started when I arrived.