Use the Correct Verb Forms - Basic English Grammar

In this video, Alisha answers 5 questions. - If the first verb in a particular sentence is used in its first form, then what form should the subsequent verb use? For instance: The poet says that the great terror of Russia crippled[...] the Russian people. In this sentence, I used the first form for the first verb (says). For the second verb, I have used the second form of the verb (cripple). Is my sentence grammatically correct? Can you explain? And when do we use verb forms 1/2/3? - When do we use ""someone"" and ""some one"" and ""anyone"" and ""any one""? What is the difference between these two combined and separated words? - Could you please explain why ""a"" is used for cellphone, and ""the"" is used for table in this sentence ""there is a cell phone on the table."" - Would you please show us the differences among ""suggest, advise, offer, recommend and propose""? - What's the difference between ""us"" and ""we"".