@bobsal u1553115,
hello bobsal i have had a go and this is what i guessed
my brother is much shorter than you: adjective
the new supermarket was opened last year: present perfect
i have already told you: present perfect simple
he is swimming really well: present perfect simple
i haven't been to the gym for years; present perfect
if you don't do the work, you wont pass the exam: second conditional
i cant play the saxophone: modal verb
he's been working all night: past perfect
by the way these are all wrong