# Yahweh of hosts ... says this

Jeremiah often uses these words to introduce an important message from Yahweh. See Jeremiah 6:6.

# See

"Listen" or "Pay attention to what I am about to tell you"

# before your eyes

"in front of you" or "where you can see". This phrase is plural and refers to the people of Israel. 

# in your days

"during your lifetime"

# the sound of joy and the sound of gladness, the sound of the groom and the sound of the bride

See how you translated this in Jeremiah 7:34.