Please Help identify if it is a weak or strong status between the entity's, and why.

confused about this part and how primary keys are linked to strong and weak entity's. Thanks

Forum Thread PK ForumID PK ThreadID ForumActive ThreadLocked Post ForumName Thread Sticky PK PostID ForumDescription Moderator Action ThreadActive PK ModeratorActionID Lod PostSubject ThreadSubject OH FK PostQuoted FK ForumID ModeratorAction Description -OC FK Forumid ThreadViewCount PostMessage Forum Moderator FK PersonID PostQuoted Text FK Thread StartedBy PK,FK1 ForumlD FK ThreadID PostDate ThreadDate Created PK,FK2 PersonlD FK PostThreadID FK PostReply To PostIPAddress ThreadFollower FK PersonID PK,FK1UserID EmailMessage PK EmailMessageld PK,FK2 ThreadID EmailSubject EmailCreateDate EmailSendDate User EmailTextContent PK UserID EmailHTML Content UserName EmailMessageSender FK CreatedBy UserFirstName UserLastName Recipient PK,FK1 EmailMessageld UserEmailAddress Terms UserPassword PK,FK2 UserID PK TermsID Userls Staff Terms Subject UserisActive Terms Content TermsAgreed 0 PK,FK1 TermsID Useris Super User TermsChanges UserLastLogin TermsCreateDate PK,FK2 UserID UserDate Joined TermsChangeDate TermsAgreedDate Match each entity with the correct "strong" or "weak" status. Forum Strong EmailMessage Strong Terms Strong Forum Moderator Strong Post Weak