If you (have) ... a typewriter, i would type it myself

1/ put the verbs in brackets in the correct from [conditional sentence type 2];
a/ if you [have] .............a typewriter , i would type it myself
b/ i would keep a horse if you [can] ..............afford it
2/ rewrite these sentences using condilional sentences;
a/ mary is shy ; that's why doesn't enjoy parties.
-if.........................................................................
b/ i haven't got a key , so i can't get in
-if ....................................................................
c/ i don't have a computer , so i can't work faster
-if.............................................................
3/