::to+dosth./:not(never)todosth./not(never):wh-/how+:薁(1)Form:±(Not)Todosth.+V+…罿±It+V+…+(not)(2)Examples:蚂【Note】:蒅(1)Form:±S+Be+(not)todosth./(2)Examples:肁Thestudents’taskinschoolistostudyhard,Allthattheycandois(to)WhatIshoulddois(to)【Note】Whenthesubjectisaclausewiththewords“all,what,do”,theinfinitiveusedaspredicativecanomitthesignoftheinfinitive“to”.:肁(1)Form:±S+Vt+(not)±S++adj.+(not)±S+Vt+wh-/howtodosth.=S+V(t)+±S+Vt+it+adj./n.+(2)Examples:莈I’Idon’tknowwhattodonext.(=Idon’tknowwhatIshoulddonext.)薈Theydidn’(=Theydidn’tdecidehowtheycouldgotothestation.)羃Hefeltitapit
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