[ Grammar ]
What type of sign does this pic belongs to?
A. Permission
B. Obligation
C. Prohibition
D. Allowance

Random Topics:
InfinitivesAuxiliaries VerbLanguage Features: Reflective ArticleVerbs + Infinitives / Gerundsused to vs be used to vs get used toWish clauseWill or Going toPronouns and AntecedentsPast and Past ContinuousActive and PassiveOther quiz:
Grammar › ViewWhat time ______ you ______ this morning?
A. do/wake up
B. do/woke up
C. did/woke up
D. did/wake up
Grammar › View
The boys __________ in the badminton court yesterday afternoon.
A. is playing
B. was playing
C. were playing
I _________ sleep last night.
A. can’t
B. couldn’t
C. won’t be able to
D. shouldn’t
Vocabulary › View
(adj) not clear; uncertain
A. definite
B. doubtful
C. reliable
D. vivid