First Conditional

ANSWERS 1: UNLESS GEORGE GIVES
EXPLANATION
FUTURE SIMPLE + IF NOT + PRESENT SIMPLE => UNLESS + PRESENT SIMPLE + FUTURE SIMPLE
More Examples:
He won't pass the exam unless he doesn't work harder. X UNLESS must be followed by an affirmative verb!
Unless he passes the exam, what will he do? X UNLESS is not used in most questions!
If he doesn't pass the exam, what will he do? V We use IF NOT in questions!

ANSWERS 2: AS LONG AS | SO LONG AS
EXPLANATION
AS LONG AS = PROVIDED (THAT) = PROVIDING (THAT) = ON CONDITION (THAT) + PRESENT TENSE
More Examples:
She will come, as long as she will be invited. X AS LONG AS must be followed by present tenses!
She will come, as long as she is invited. V

ANSWERS 3: IN CASE IT
EXPLANATION
(JUST) IN CASE + VERB (PRESENT TENSE) => because of the possibility of something happening.
More Examples:
Take your umbrella with you in case it rains. V IN CASE + VERB!
In case of danger, call the police. V IN CASE OF + NOUN!

ANSWERS 4: BUT ONLY IF
EXPLANATION
(BUT) ONLY IF + PRESENT TENSE => in no other situation, place, etc..
More Examples:
I'll tell Adam, but only if he won't tell anybody else. X Do not use WILL after IF ONLY!
I'll tell Adam, but only if he doesn't tell anybody else. V

ANSWERS 5: HAPPENS TO BE
EXPLANATION
IF ... HAPPEN TO/IF ... SHOULD HAPPEN TO/IF ... SHOULD => is used to talk about sth that may by possible, but is not very likely.
More Examples:
If robots happened to do all of man's work, man would not have to work. X We do not use this pattern in unreal conditionals!
If they happen to come again, tell them I am not available. V

ANSWERS 6: IF YOU WILL COME
EXPLANATION
IF + WILL => used in requests.
More Examples:
I will be most grateful to you if will sign the documents. V FIRST CONDITIONAL (POLITE REQUEST)
I would appreciate it if you wouldn't smoke in here. V SECOND CONDITIONAL (MORE POLITE REQUEST)