谁帮我解答一下这些语法题阿.1.Pleaseillustratewithtwoexamplestheuseofcollectivenounsthatcouldbesingularorpluralforms.2.Couldyouexpiainthesubjective-verbagreementfortheexistentialsentence?3.howdoyouunderstandth

　　谁帮我解答一下这些语法题阿.

　　1.Pleaseillustratewithtwoexamplestheuseofcollectivenounsthatcouldbesingularorpluralforms.

　　2.Couldyouexpiainthesubjective-verbagreementfortheexistentialsentence?

　　3.howdoyouunderstandtheconceptofdoublegenitive?

　　4.Whatisthedifferencebetweenanaphoricspecificreferenceandcataphoricspecificreference?

　　5.Howdoyouachievethepronounagreementinadiscourse?

　　6.Pleaseexplaintheuseofthereflexivepronounasanobjectinasentence.

　　7.Whatisthedifferencebetweenthepastprogressiveaspectandsimplepasttense?

　　8.Whatisthedifferencebetweenpresentperfectaspectandsimplepasttense?

　　9.Pleaselistatleastfivewaystoexpressfuturetime

　　10.Pleaseexplainthreewaystoexpressthebe-typesubjectivemood.

　　11.Couldyousummrisethebasicprincipleofspistemicuseofmoda;auxiliary?

　　12.Couldyoupleaseillustratetheuseofabsoluteconstruction?