Помогите пжл ответить на вопросы по инглишу!!

1) In recent years Brazil’s wild animals such as monkeys and parrots have become the target of a vast and flourishing illegal trade.(have become - Present Perfect; to become - infinitive)
2) Today much of the investment is going into an export sector.(is going present continuous; to go - infinitive)
3) Enormous technological advances led to increased competition in the market. (led - Present Siple; to led - infinitive)
4) People buy and sell goods in exchange.( buy - Present Simple; to buy - infinitive); (sell - Present Simple; to sell - infinitive)

1) The deal should allow the banks to cut the weight of property and public-sector loans in their balance sheets.(should)
2) Managers and other computer users cannot fully rely on the information computers provide them with.(can - /cannot)
3) Efficient production may be the result of several factors.(may)
4) Consumer research is to solve specific problems of marketing and product policy. ( глагол - is- основной глагол в значении "является (служит) ".т. е. в этом предложении модального глагола нет.

Модальные глаголы и их эквиваленты-
Should-следует, его обычный синоним-ought to
Cannot- не могут, are not able
May be-может быть, can be,might be
Is to(to be to)-должен в силу договоренности, запланированности, must,has to

present perfect, to become
present continuous, to go
present simple, to advance
present simple, to buy, to sell

should
cannot
may
to be to

1) have become - Present Perfect, инфинитив - to become;
2) is going - Present Continuous, инфинитифф - to go ;
3) led - Past Simple, инфинитиффф - to lead
4) buy, sell - Present Simple, инфинитифф - to buy, to sell

1) should
2) cannot
3) may
4) to be to )))

Собственно, вот =)