the best + PRONOUN + can|could

Point 118 in CLAUSES is defined as:

‘the best’ as a superlative adverb + pronoun + ellipted ‘can’ or ‘could’.

An iWeb search for:

the _RRT _P can|could .

1 THE BEST I CAN . 1455
2 THE BEST THEY CAN . 840
3 THE BEST I COULD . 650
4 THE BEST THEY COULD . 252
5 THE MOST THEY CAN . 19
6 THE MOST I CAN . 18

We‘ll do the best we can.