Though you were on the right track, it's actually Support for THE president.
No, it is not correct to say "which president is he." The appropriate phrasing would be "which president is that" or "who is he as president." The word "which" typically requires a specific set of options, whereas "who" is used for identifying individuals.
The phrase "support to" is not grammatically correct in standard English usage. The correct construction is typically "support for" when referring to providing assistance or backing to someone or something. It is important to use the appropriate preposition to convey the intended meaning accurately.
Yes, it is. For example, "I am thankful for the support of my friends and family."
Both; for is a person & of would be for something besides.
Yes, it is correct, but to be more correct, it needs a hyphen: "The Vietnam War was over, and then-president Richard Nixon found himself embroiled in the Watergate scandal."
Yes, it is grammatically correct to say "Could you support me?" This sentence is a polite request asking someone for assistance or help. The use of "could" implies a level of courtesy, making it appropriate in various contexts.
Looks quite good to me, but I would put 'The' in front of 'president'.
There are many equally correct ways of describing how the President of the US is elected. One would be to say that the people in each state vote for Electors who in turn vote for the team of President and Vice President. This is an indirect election process.
It is more appropriate to say that the Vice-President of the United States has as one of his constitutional responsibilities to serve as President of the US Senate.
In Ireland the correct formal address is "Your excellency" but in practice most people would say Mr./Madam President or President Higgins/McAleese etc
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"Support in applying" is more correct than "support with applying."