find boring

I find the class boring.

私は授業を退屈に感じます

I find the afternoon class boring.

私は午後授業を退屈に感じます

I find the afternoon class of nothing but explanation boring.

私は午後説明だけが続く授業を退屈に感じます

I find the long afternoon class of nothing but explanation boring.

私は午後説明だけが続く長い授業を退屈に感じます

I sometimes find the long afternoon class of nothing but explanation boring.

私は午後説明だけが続く長い授業を時々退屈に感じます