Hello, I am Yoshi from NILS Japanese language school. You learn a few more new expressions today.
[N (object) は]
You learn in Leson 6 that the particle を is attached to the direct object of verbs. Here you learn that hte object is made a topic by replacing を with は.
(Example 1)
ここに　荷物（にもつ）を　置かないで　ください。
Please don’t put parcels here.
荷物は　ここに　置かないで　ください。
As for parcles, don’t put them here.
(Example 2)
吉野家（よしのや）で　昼ごはんを　食べます。
I have lunch at Yoshino-ya.
昼ごはんは　吉野家で　食べます。
As for lunch, I have it at Yoshino-ya.

[N (time) までに V]
The point in time indicated by までに is the time limit by which an action is to be done.
(Example)
会議は　5時までに　終わります。　　The meeting will be over by five.
土曜日までに　本を　返さなければ　なりません。
I must return the book by Saturday.

Make sure you do not confuse までに with the particle まで.
5時まで　働きます。　　I work until five.

October 31st News, from NILS Japanese language school.