April – soo-yu-eh
Written as sìyuè or siyue
Note: April in Mandarin Chinese ends with "month" which we already know is yu-eh (yue).
April is soo-yu-eh (siyue).
To remember that the beginning of the word for April is pronounced soo (si) use the following mnemonic:
I could only swallow a pill (April) with soup (soo).

Tones
Soo (soup) is a 4th tone with \ as an accent.
Associate soup, a 4th tone, with lowering things like trip or slide down. See Tones and Mnemonics.

He fell into a big bowl of soup.
Remember
Soo = 4th tone = \