sarang is the rootword. but how am I going to use it?
Saranghae
Saranghamnida
Sarangeul
Saranghaeyo
Saranghanda
Sarangeun

In the words above, how can I use it in sentences or in speaking?

Question

sarang is the rootword. but how am I going to use it?
Saranghae
Saranghamnida
Sarangeul
Saranghaeyo
Saranghanda
Sarangeun

In the words above, how can I use it in sentences or in speaking?

Answer

Agreed with Mojave - you will need to get a handle on the particles, basic conjugation (learning Hangul also helps with this), and formal/informal/honorific forms. But to give you a quick run-down:
Saranghae - to love (present tense). On it's own it would just mean "I love you"
Saranghamnida - to love (present tense, honorific). Honorific form is for elders, etc.
Sarangeul - love (as a sentence object)
Saranghaeyo - to love (present tense, formal). Formal tone is for non-casual situations or when you don't know the person well, or if they are older.
Saranghanda - loving (narrative form)
Sarangeun - love (as sentence topic)

Answer

You should really learn Hangul, the Korean alphabet. Grammar and spelling will make much more sense. Sarangeul contains the object particle and Sarangeun contains the topic particle, so they are basically the noun "love" used as the object or topic of a sentence, respectively. The other four are conjugated forms of the verb "to love" in varying degrees of formal/informal tone.

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