虚拟语气在各种从句中的应用一在主语从句中，用来表示惊奇、惋惜、理应如此等，其谓语形式是“(should) + 动词原形”，常用于下列三种句型中：1. It is necessary (vital,important, natural, strange, wonderful, proper, right, good, wrong, impossible, etc.) + that -clausee.g. It is important that we (should) master a foreign language.2. It is a pity ( a shame, no wonder, your duty, etc.) + that-clause.e.g. It is a great pity that he should be so careless.3. It is suggested (ordered, proposed, requested, etc.) + that-clause.e.g. It is requested that sh
