ページ1:

<No commas after conjunctions >
Conjunctions?
The words that connect sentences
e.g).
S+V (+A)
「
[clause 1
I didn't know that he went out.
Sentence
sentence
Conjunction
°
J
Nor, after conjunctions
adverb
eg).
X and, she left here.
O and she left here.
x but, I went to see him..
O but I went to see him.
exception
O Therefore, this is right.
O However, this will not be right.

ページ2:

Location of the conjunction
e.g).
O If
you want,
I will give you this book.
emphasized.
I will give you this book (,) if you want.
When I came home, my mother was sleeping.
0 My mother was sleeping (,) when I came home.
•While vs During
- while +
で
(conjunc=
Conjunction
Sentence (S+V(+α))
-During + noun.
Preposition.
e.g)
I went to SKYTREE while I stayed in Tokyo.
S
V
I went to SKYTREE during my stay in Tokyo
noun.