Spoken and written contractions with question words

Is
(a) “When’s he coming?” “Why’s she late?”  (Spoken only)
Are
(b) “What’re these?” “Who’re they?” (Spoken only)
Did
(c) “Who’d you see?” “What’d you do?” (Spoken only)
Will
(d) “Where’ll you be?” “When’ll they be here?” (Spoken only)
Is, are, did and w ill are usually contracted with question words in speaking. These contractions are usually NOT written.
Is
(e) “Where’s Ed?” “What’s that?” “Who’s he?” (Spoken)
(f) “Where’s Ed?” “What’s that?” “Who’s he?”(Written)
Only contraction with is and where, what or who are commonly used in writing