Je drinkt thee= You drink tea.
You just need to learn the conjugation 'rules': for ik we only use the stem of the verb, for je/jij/u/hij/zij/ze/het we use the stem and add a '-t' at the end of it; for we/wij/jullie/zij/ze we use the "unconjugated form", that is, the stem with -en.
Remember that the only way to distinguish between the singular form and the plural form of ze/zij is by looking at the verb.
Actually the Dutch r is pronounced differently in some words from both languages, but sometimes the same as one of them. I know this won't help you, but it's just not that simple. Dutch people also differ from eachother in this aspect. Fortunately, in most cases Dutch people will understand you perfectly if you don't get the pronounciation exactly 'right'.