We don't have Perfect tenses. So you should use just past simple. ''I have read the book'' - present perfect, but in Russian it sounds like past simple ''Я прочитал книгу". Tenses in Russian are easier than English

This week has been difficult. Эта неделя была трудной. I have been considering your proposal. Я рассматривал ваше предложение. Usually using present perfect tence you should use russian verb in perfective aspect. When using perfect continuous tense you should use imperfective aspect of the verb. I have considered you proposal. - Я рассмотрел ваше предложение.

Present Perfect in Russian express with suffix С, or in other cases they answering for a question "Что сделать?" ("what you HAVE DONE?") не "Что делать?" "What ARE YOU DOING?" For instance Continuous- делаю- doing, прячу-hidding, хожу-going Perfect Continuous- делал-have been doing, прятал -have been hidding, ходил- have been going(на протяжении времени) Present Perfect with С - Сделал-have done, Спрятал-have hidden, Сходил-have gone. В Русском языке это называется совершенные и несовершенные формы глаголов. Это не показатель времени, а форма/тип глагола. In Russian language these types of verbs are not a tence as in English they are just forms of verbs in perfect/or unperfect. Разница с грамматикой романских языков, в том числе и английского в том что у нас это вид глагола, как в английском причастие и деепричастие, что в Русском, наоборот, является частями речи. Participle 1 and 2 are not parts of speech in English Grammar in Rissian they are pfrts of speech. Verbs in perfect forms are types of verbs in English Grammar not parts of speech as in Russian, thats the different you cant to undestand easy.

Patrick, there is NO verbs in PERFECT PRESENT tense in Russian. The perfect form of verb means that the activity has complited already or it's going to be completed in the future. Your examples are in imperfect past tense in Russian. I have been considering your proposal = Я рассматривал ваше предложение (I have been considering your proposal, but I have no answer yet). The perfect past tense in russian: Я рассмотрел ваше предложение = I have considered you proposal (I have considered your proposal, and I'm ready for collaboration).