"I'm sorry, but this shirt is ..... torn on the sleeve. Can I have a different one?"

"It is 5:00 AM. ..... it is too early to call him on the phone."

"I don't like this chair; the back is ..... hard and uncomfortable."

"We are lost. Could you ..... check the map on your phone?"

"I cannot find my keys. ..... I left them in the cafe?"

  describes a negative quality (hard/uncomfortable)

  starts a sentence to suggest a reason.

  is used for a formal guess.

  describes physical damage.

  goes inside a request for help.

"I'm ..... I can't help you with your homework tonight; I'm very busy."

"I see your ....., but I think the train is faster than the car."

"I beg to .....; I think the first book was much better than the second."

"I am not ..... about that. Let’s check the answer in the book."

"That is ....., but the museum is closed on Mondays."

  is locked by "I'm... I can't."

  is locked by the idiom "I beg to..."

  is locked by "I see your..."

  is locked by "That is... but..." (acknowledging a fact).

  is locked by "I am not... about that."