I hear that he has come back yesterday.这句子对吗,不对该怎么改呢

I hear that he has gone to school.为什么听说不用hear of?of为什么剩去不用? I hear that he has come back yesterday.这句子对吗,不对该怎么改呢 I hear that your teacher ___ to English once.Yes,he ___ there last year.A.gone;went B.has been;has been C.went;has been D.has been;went选什么?理由 he knows a lot about New York.So,he does.i hear he ____before选哪个为什么.he knows a lot about New York.So,he does.i hear he ____beforeA.had gone there B had been there C.has gone there D.has been there2.you should tell tom that he_____ to work I hear that John has come back to china,_____? A.isn't he B.hasn't I C.hasn't he D.don't I选什么顺便解释下谢谢 Li Lei has a stomachache.He's ill in hospital bow.I'm sorry ___(hear)that mr wang,my son has a bad cold .he can't go to school today a .really b.i'm sorry to hear that c.itdoesn't matter d.bad luck Bob has gone to California,I hear.Oh,I wonder when he ------- A leaves B left C was leaving D has left —Bob has gone to California.I hear.—Oh.I wonder when he ______.A.has left B.leaves C.left　D.was leaving i hear that he ___(swim)in the sea yesterday i hear that he ___(swim)in the sea yesterday 连句子.Example:1.John is ill.Iam sorry to hear that.2.He has a bad cough.He has a high fever.3.He has taken some medicines.The medicines have not helped him.4.He should stay in bed.He should go to the hospital.I think so.Iam sorry to hear that Joh I never______it.A.hear from B.hear of C.hear that D.heard what our new teacher speak english so quickly that i cannot （）what he says.a.listen b.hear c.catch i hear that his father( )since 10 years ago.a.has died b.died c.was dead d.has been dead I don't remember where _in that city when he was young.A.did he work B.he worked C.he has workedD.has he worked i　was　so　noisy　什么we　couldnt　hear什么he　said　at　the　mettinga,so　　that b,so　what c,that　what d,for　that I hardly understand. ___ he has told me. A. that B. what C. which D. who