a)Noun preposition There are nouns that are usually followed by certain prepositions: There seems to be a solution to this problem. A glance at this letter will convince you by its contents that Mike is grasping at(攫取；掠夺)your money. Is there any need for all this hurry? b)Preposition noun There are also nouns that are usually preceded by certain prepositions: A young man should be on his guard against bad company. In all probability,the mail will arrive tomorrow.7 a) Noun + preposition ◼ There are nouns that are usually followed by certain prepositions: There seems to be a solution to this problem. A glance at this letter will convince you by its contents that Mike is grasping at(攫取;掠夺) your money. Is there any need for all this hurry? b) Preposition + noun ◼ There are also nouns that are usually preceded by certain prepositions: ◼ A young man should be on his guard against bad company. ◼ In all probability, the mail will arrive tomorrow