____ he met with the difficulty did he realize that our help was of great importance
“When he _____ is not known yet.” “But when he ____, he will be warmly welcomed.”
“Your phone number again? I _____ quite catch it.” “It’s 4331577”
“When _____ he come?” “I don’t know, but when he _____, I’ll tell you.”
I had hoped to see her off at the station, but I _____ too busy.
I don’t know if she _____, but if she ____ I will let you know.