U hv to make sentences without grammar mistakes...then u hv to use bombastic words..
1) Make sentences using lots of adverbs and adjectives
Eg: She sleeps soundly on the comfortable bed.

2) Practise more with grammar. Avoid grammar mistakes
Eg: Singular and plural, tenses, etc.

3) Read a lot to improve your vocabulary
Eg: Strolling (berjalan sambil bersiar-siar)