关于关系代词的句子

第一个句子是对的。
I like Allen who is my favourite singer.
是个定语从句。主句为：I like Allen，后面的who is my favourite singer.为定语从句部份。中文意思：Allen是我最喜欢的歌手。
第二个句子不完整。
因为第二个句子的定语从句部份缺少谓语。

都错
应该是I like Allen, who is my favorite singer.

第一个对,第二个定语从句中少谓语动词

1.
the
musician
with
whom
they
work
is
very
popular
2.
i
saw
many
trees
whose
leaves
turn
black
because
of
illness.
3.
the
theory
that
he
sticks
to
is
proved
to
be
right.
4.
the
school
has
accepted
his
opinion
that
he
came
up
with
5.
the
hometown
that
he
was
familiar
with
have
changed
a
lot.
6.
this
is
the
pen
with
which
i
wrote
that
letter.
(有些句子不可以把介词放在关系代词的前面，因为是固定词组，不可以拆开的）

1 对