00311nam a2200109 a 450000500170000008200130001710000220003024500420005226000360009430000290013063000420015920251202164121.0  a425bALL  aAllen, W.Stannard  aLiving english sturucture for schools  aHyderabadbOrient Longmanc1986  avii, 184 p..b22 cm.cPB  aStructural system of standard English