to be (honorific), to come (honorific), to go (honorific)

There is/are (polite), to exist (polite)

To be; extremely polite copula used in formal settings

humble form for actions I will do for others, I am obliged to do (a task for you), I humbly perform an action on behalf of someone else

To do (humble), To venerably do

Would you please ~, Could you do ~ for me?, Would you be so kind as to ~?

When, From when, Just when

Besides, In addition, Other things

Need, Necessary, something is needed

to that extent, that much, so much

to be necessary, to be required, there is a need for...

for example, such as, for instance

To be able to, Can (potential), Able to do X

but…, and… (soft contrast), I know, but… (wanting agreement)

Bound to be, Expected to be, Should be (able)

whether something is true or not, if or not, whether or not

When/at the moment, Whenever, As soon as

must; have to (informal), it's necessary to do something; if you don't, there will be trouble, bad things happen if you don’t do something; you must do it

Hardly possible, Cannot be, Highly unlikely

There is only, There are only, Nothing but