1.
a) I
b) Jack
c) someone
d) you
e) my dog
f) people who live in glass houses
g) I

2.
Can you identify what kind of clause or phrase the highlighted part of each of these sentences is?
a) Ever since they first met, Nora has been head over heels in love with Alfonse.
Adverbial clause
b) You should be grateful to all the people who have given you so much help.
Adjective clause or relative clause
c) I am usually fast asleep in bed by ten o' clock.
Adverbial phrase
d) She tried several times, but because of her repeated failures she became more and more frustrated.
Adjective phrase. This one is a "predicate adjective" which complements the verb "became".
e) Despite your accusations, I swear that I am innocent.
Adverbial phrase
f) Is that boy in the blue cardigan Rebecca's brother?
Noun phrase. This is the subject of the sentence. Note that the verb goes before the subject in a question.
g) Janice has been arrested.
Verb phrase
h) I think she has been arrested for drunken driving.
Adverbial phrase
i) If anyone finds out the truth, she will be in a lot of trouble.
Adverbial clause
j) I've been under the weather recently, so I went to see the doctor.
Adjective phrase. Prepositional phrases are usually adverbial, but this one is an idiomatic expression that functions as an adjective, like "unwell".