How to Say "i strengthen" in Spanish
The Spanish word for “i strengthen” is “refuerzo” — B1 level.
English → SpanishB1
verbB1
making a bond or structure more solid

Examples
Yo refuerzo la seguridad de mi casa con una alarma nueva.
I am reinforcing my house security with a new alarm.
Cada tarde, refuerzo mi vocabulario con esta aplicación.
Every afternoon, I strengthen my vocabulary with this app.
Si yo refuerzo los cimientos, la casa será más segura.
If I strengthen the foundations, the house will be safer.
The Spelling Change
This verb is a 'shoe verb.' The 'o' in the middle changes to 'ue' whenever the stress falls on it (like in 'refuerzo'), but stays as 'o' when the stress is on the ending (like in 'reforzamos').
Related Translations
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