Learn Hardcore Hebrew: לפעמים השיעור קל, ולפעמים הוא קשה מאוד, ואני רוצה ללכת הביתה. - Sometimes the lesson is easy, and sometimes it is very difficult, and I want to go home.

Because Hebrew often uses the pattern לפעמים ... ולפעמים ... to mean sometimes ... and sometimes .... Repeating לפעמים makes the contrast explicit.

So the structure is:

לפעמים השיעור קל = sometimes the lesson is easy
ולפעמים הוא קשה מאוד = and sometimes it is very hard

This is completely natural Hebrew.

What does the ו־ at the beginning of ולפעמים and ואני mean?

ו־ is the Hebrew word for and, but unlike English, it attaches directly to the next word as a prefix.

So:

ולפעמים = and sometimes
ואני = and I

It is usually pronounced ve-, though its pronunciation can change a little in some environments.

Why does השיעור start with ה־?

ה־ is the definite article, meaning the.

So:

שיעור = lesson / class
השיעור = the lesson / the class

Hebrew attaches the directly to the noun instead of writing it as a separate word.

Why is there no word for in ?